If youre planning a CircuPool RJ45+ installation, this comprehensive how-to guide covers every step: sizing the system for your pool, plumbing with tees and unions, safe 110/220V wiring to the CircuPool RJ Series control module, dialing in salinity to 300093500 ppm, and completing accurate salt cell calibration steps. Well also break down startup and Boost mode cost so you can budget with confidence. Whether youre upgrading from tablets or building a new saltwater system, youll find actionable, code-aware instructions to get clear, low-maintenance water fast.
What Youll Need: Tools & Materials
Gather the right tools and parts before you begin your CircuPool RJ45+ installation. Having everything on hand streamlines the job and helps you complete plumbing and wiring safely in one session.
- CircuPool RJ45+ salt cell with unions and O-rings
- CircuPool RJ Series control module (power center)
- CircuPool flow switch (included with RJ Series kits)
- Schedule 40 PVC pipe and fittings (match your equipment pad 1.5 or 2)
- Plumbing tee and unions for serviceability and future add-ons
- Primer and PVC cement rated for pressure lines
- Pipe cutter or saw, deburring tool, measuring tape, marker
- Mounting hardware for the control module (anchors/screws)
- Electrical: appropriately rated breaker, GFCI protection, outdoor-rated wire/conduit, wire strippers, torque screwdriver
- Bonding wire and clamp (if not already in place)
- Pool salt (high-purity sodium chloride without additives)
- Water test kit or meter capable of measuring salt (salinity), stabilizer (CYA), pH, alkalinity, and calcium
- Optional: Check valve (especially if using an inline tablet feeder upstream of the cell), isolation valves, bypass loop materials in freeze-prone areas
Planning and Sizing for CircuPool RJ45+ Installation
Proper planning minimizes rework and ensures your salt system runs efficiently for years. Sizing is the most important decision: select a cell that exceeds your pools volume so it can keep up with chlorine demand in peak summer without running excessively long hours.
How to Size the CircuPool RJ45+ for Your Pool
The CircuPool RJ45+ is typically rated for pools up to 45,000 gallons in ideal conditions. For best results, oversize your salt system by 1.5x2x your actual water volume to handle heat waves, heavy use, and storms. Oversizing lets you run at a lower output percentage, extending cell life and reducing scale. For example, an RJ45+ is an excellent fit for most 18,00030,000 gallon pools, and still provides comfortable headroom for 35,000ish gallon pools in moderate climates.
| Pool Volume | Suggested SWG Size | Typical Output Setting (Summer) | Estimated Daily Runtime |
|---|---|---|---|
| 10,00015,000 gal | RJ30+ or RJ45+ | 2035% | 69 hours |
| 15,00025,000 gal | RJ45+ | 3050% | 812 hours |
| 25,00035,000 gal | RJ45+ (oversized) | 5080% | 1014 hours |
| 35,00045,000 gal | RJ45+ (mild climates) | 70100% | 1216 hours |
Note: Exact settings depend on bather load, sunlight, stabilizer (CYA), and water temperature. Always aim for a steady free chlorine (FC) residual appropriate to your CYA level.
Where to Locate the Salt Cell and Flow Switch
Install the RJ45+ cell as the last device in the return line, after the pump, filter, heater, and any inline chemical feeders. The CircuPool flow switch should be installed before the cell (but after all other equipment) in a straight run of pipe. Follow the flow arrows on both the flow switch and cell body. Provide at least 12 inches of straight pipe upstream of the flow switch to avoid turbulence that can cause nuisance No Flow readings.
Environmental Placement & Mounting the Control Module
Mount the CircuPool RJ Series control module on a vertical surface near the equipment pad, out of direct sprinkler spray and away from constant sun exposure if possible. Allow adequate ventilation space around the housing and position it where you can read and operate the display without kneeling into mud or gravel. Plan wire routes and conduit so the power cable and flow switch cable arent under tension or pinch points.
Plumbing the Cell, Flow Switch, and Bypass
Crisp plumbing work ensures leak-free operation and easy servicing. Use unions at all key components and consider a future-friendly layout with a bypass or extra tee if you anticipate upgrades.
Ideal Plumbing Layout
- Pump discharge to filter inlet.
- Filter outlet to heater inlet (if installed).
- Heater outlet to CircuPool flow switch (straight run, arrow with flow).
- Flow switch to CircuPool RJ45+ salt cell (arrow with flow).
- Cell outlet back to pool returns.
If you use an inline tablet feeder or erosion feeder, install a check valve between the feeder and the salt cell to prevent concentrated chlorinated water from backing into the cell when the pump stops.
Using a Plumbing Tee and Unions for Serviceability
Incorporate a plumbing tee and unions near the cell to simplify seasonal removal and maintenance. A tee with a capped branch creates a convenient injection or testing port. Unions on both sides of the cell and flow switch let you remove components without cutting pipe. Always lubricate O-rings with a pool-safe silicone lubricant and hand-tighten unions; do not overtighten with tools.
PVC Gluing Best Practices
- Dry-fit all parts and mark joint alignments with a marker.
- Use primer on both pipe and fitting, then apply PVC cement evenly.
- Insert fully with a quarter-turn twist and hold for 30 seconds.
- Wipe excess cement; support pipes until cured.
- Observe cure times per cement label before pressurizing the system.
Orientation, Space, and Winterizing
The CircuPool RJ45+ cell can typically be installed horizontally or vertically; allow clearance to remove the cell for inspection. In freeze-prone regions, design the pad with unions and isolation valves so you can drain or remove the cell during winterization. If you anticipate frequent acid cleanings due to hard water, consider a quick-disconnect cell stand accessory to make cleaning safer and faster.
Electrical: 110/220V Wiring Salt System to the CircuPool RJ Series control module
Wiring the CircuPool RJ Series control module correctly is essential for safety and performance. The RJ power center is designed to accept either 110/120V or 220/240V input. Always follow the product manual and local electrical codes, and use a GFCI-protected circuit. If youre not comfortable with line-voltage wiring, hire a licensed electrician.
Powering Options and Interlocks
- Single-speed pump with timer: Feed the RJ control module from the load side of the same timer so power to the salt system is off whenever the pump is off.
- Variable-speed pump: Use a relay or the pumps built-in automation output (if available) to interlock the salt system so it cant run without flow. The flow switch is a safety, not the primary on/off.
- Automation system: Many pool controllers can switch power to the RJ control module through an auxiliary relay.
GFCI, Bonding, and Grounding
Equip the circuit with GFCI protection. Bond the control module and associated metallic components to the pools bonding grid according to code. Proper bonding reduces shock risk and helps suppress corrosion. Ensure the equipment is grounded per manufacturer instructions.
Wire Gauge, Breakers, and Current
The RJ45+ control module has a modest current draw. Typical consumption under full production is roughly 150220 watts. Select wire gauge and breaker size per the nameplate rating and local code. Many installs use 14 or 12 AWG copper conductors depending on voltage, run length, and breaker size; consult your electrician for final sizing.
| Supply Voltage | Approx. Max Current | Common Breaker | Notes |
|---|---|---|---|
| 120 VAC | 23 A | 15 A GFCI | Use 14 AWG min; 12 AWG for longer runs |
| 240 VAC | 12 A | 15 A double-pole GFCI | Use 14 AWG min; 12 AWG for longer runs |
Values are typical; verify the exact ratings in your specific control module documentation.
Step-by-Step 110/220V Wiring Salt System Procedure
- Shut off power at the main breaker and lock out/tag out if possible.
- Mount the CircuPool RJ Series control module on the wall. Plan conduit runs and drip loops.
- Set the input voltage selector or wiring jumpers inside the control module to match your supply (110/120V or 220/240V) per the manual.
- Pull conductors through conduit from the GFCI-protected source (timer/relay) to the control module.
- Terminate hot(s), neutral (if 120V), and ground on the labeled terminals. Torque screws to spec.
- Bond the unit to the pool bonding grid using the provided bonding lug and solid copper bonding wire.
- Route and connect the flow switch cable to the control modules low-voltage port, observing polarity or connector keying.
- Double-check all terminations, close covers, and restore power.
Important: The salt system must not be energized without water flow. Use the same timer or automation schedule as your pump, and rely on the flow switch only as a secondary safety.
Adding Salt and Achieving Salinity 30003500 ppm
The CircuPool RJ45+ operates best when the waters salinity is within 30003500 ppm, with many installers targeting 32003400 ppm as a sweet spot. Test current salinity first, then calculate how much salt to add. Always use high-purity pool salt (no anti-caking agents, no iodized table salt) and add it in batches to avoid overshooting.
How Much Salt to Add: The Formula
Use this formula to estimate pounds of salt needed:
- Pounds of salt = (Target ppm 9 Current ppm) 9 Pool gallons 9 0.00834 3 1000
Example (from 0 to 3200 ppm in 15,000 gallons): (3200 9 0) 9 15,000 9 0.00834 3 1000 3 approximately 400 lbs of salt (10 bags at 40 lb each).
| Pool Gallons | Salt to Reach 3200 ppm (from 0 ppm) | 40-lb Bags (approx.) |
|---|---|---|
| 10,000 | ~267 lbs | 7 bags |
| 15,000 | ~400 lbs | 10 bags |
| 20,000 | ~534 lbs | 14 bags |
| 25,000 | ~667 lbs | 17 bags |
| 30,000 | ~800 lbs | 20 bags |
If you already have some salt in the water, test first and subtract the existing ppm when calculating.
How to Add Salt Correctly
- Turn off the salt system and set your valves so water circulates through the pool returns.
- Broadcast salt across the deep end with the pump running. Brush any mounds until fully dispersed.
- Run the pump continuously 24 hours to dissolve. Do not allow undissolved salt to sit on soft surfaces.
- After 24 hours, test salinity. Aim for 30003500 ppm. Adjust in 1015% increments to avoid overshooting.
- Only turn on the RJ45+ once salt is fully dissolved and water is clear.
Tip: Warm water dissolves salt faster; cold water takes longer. If youre below 602F, be patient and verify with a reliable meter before starting the system.
First Power-Up: Step-by-Step CircuPool RJ45+ Installation and Startup
With plumbing complete and salinity in range, its time to commission the system. Follow this workflow to protect equipment and get predictable results on day one.
- Inspect Plumbing: Verify arrows on the CircuPool flow switch and RJ45+ cell point in the direction of return flow. Ensure unions are hand-tight and O-rings seated.
- Prime and Leak Check: Run the pump. Check for drips at unions and fittings. Fix any leaks now.
- Power the Control Module: Energize the circuit through your timer or relay. The CircuPool RJ Series control module should boot and show status.
- Confirm Flow: The display should indicate Flow when the pump is running. If you see No Flow, verify straight pipe length, clean filter, and correct flow switch orientation.
- Verify Chemistry: Test pH (7.47.8), TA (6090 ppm), CH (200400 ppm), CYA (6080 ppm for SWG), and salinity (30003500 ppm). Balance as needed before generating chlorine.
- Initial Output Setting: Start the RJ45+ at 3050% output. This conservative setting prevents overshooting chlorine while you dial in runtime.
- Run for 2448 Hours: Monitor free chlorine daily. Adjust the output percentage or pump runtime until your FC holds steady in the recommended range for your CYA.
- Record Baseline: Note your salinity reading, output %, runtime, and FC. These become your reference points throughout the season.
Salt Cell Calibration Steps for the CircuPool RJ45+
Accurate salinity readings ensure the control module delivers consistent chlorine without nuisance high/low salt alarms. Calibrate the system so the display matches a trustworthy independent test.
Before You Calibrate
- Verify the water is fully circulated and the salt is 100% dissolved (usually 24 hours after addition).
- Test salinity with a reliable meter or high-quality test kit.
- Clean the filter and confirm strong, steady flow through the system.
Performing the Calibration
- With the pump running and Flow indicated, bring up the salinity menu on the CircuPool RJ Series control module (refer to your models exact button sequence).
- Initiate the calibration mode. Many RJ Series controllers require pressing and holding the confirmation/enter key to start a sampling cycle.
- Allow the system to sample for several minutes. Avoid changing pump speed or valve positions during sampling.
- Compare the displayed salinity to your independent test. If your controller supports user alignment, adjust the reading to match your measured salinity within the 30003500 ppm target range.
- Save settings and exit calibration. The control module should now report a value that closely tracks your test results.
If your controller does not allow manual alignment, repeat calibration after confirming chemistry and temperature are stable; some units auto-learn after several run cycles.
Post-Calibration Checks
- Re-test salinity in a day or two. Readings may drift slightly as the system stabilizes.
- If readings still differ by more than ~200 ppm, inspect for scale on the cell plates and recheck the test method.
- Keep logs of salinity and chlorine production to spot trends early.
Dialing In Output: Daily Runtime, Boost Mode, and Startup Cost
Once calibrated, fine-tune the RJ45+ output and pump schedule to maintain a consistent chlorine residual while minimizing energy use. Understanding Boost mode and the cost of startup helps you plan your budget.
Setting Output and Runtime
- Begin at 3050% output and 812 hours of pump runtime per day for most mid-size pools.
- Increase output or runtime if FC drops below your target; decrease if FC rises too high.
- High UV and bather load require more production; cloudy days and cool water require less.
The RJ45+ can produce roughly 2.02.5 lbs of chlorine per 24 hours at 100% output (typical for a 45k-cell class). Each 10% output for 10 hours produces around 0.080.10 lbs chlorine. Track your FC test results and adjust in small increments every few days until stable.
Using Boost (Super Chlorinate) Mode
Boost mode commands the cell to run at 100% for a factory-set period (often 24 hours) to quickly raise chlorine after parties or heavy rain. Use it sparingly; prolonged Boost isnt necessary if your regular output is dialed in. Remember that Boost increases energy usage during the activation window.
Startup and Boost Mode Cost: Realistic Estimates
Two costs matter during startup: salt and electricity. Salt is a one-time upfront fill until losses from splash-out, backwashing, or dilution accumulate. Electricity includes the cell draw and any added pump runtime needed.
Salt Cost at Startup
- Typical 40-lb pool salt bag: $712 (varies by region).
- Example 15,000 gal to 3200 ppm: ~400 lbs 3 10 bags 3 $70120.
- Example 20,000 gal to 3200 ppm: ~534 lbs 3 14 bags 3 $98168.
Electricity Cost for Generation
Assume the RJ45+ draws ~0.20 kW at 100% output. Your variable-speed pump at a low filtration speed might draw 0.400.80 kW. Using $0.15/kWh as an example tariff:
- Cell at 50% for 10 hours: 0.20 kW 9 0.5 9 10 h = 1 kWh/day 3 $0.15/day.
- Cell at 100% for 10 hours (Boost day): 0.20 kW 9 10 h = 2 kWh 3 $0.30 extra that day.
- Pump incremental cost depends on your existing schedule; at 0.60 kW for 10 hours: 6 kWh 3 $0.90/day.
Combined, a typical daily operating cost might be $1.002.00 including pump and cell at low speed. Boost days add a few extra dimes in electricity. Actual numbers vary with your equipment and local utility rates.
| Scenario | Cell Duty | Cell kWh | Cost @ $0.15/kWh | Notes |
|---|---|---|---|---|
| Normal day | 50% for 10 h | ~1.0 | $0.15 | Plus pump cost |
| Boost day | 100% for 10 h | ~2.0 | $0.30 | Plus pump cost |
| Extended runtime | 70% for 14 h | ~2.0 | $0.30 | Heavy use/heat wave |
Maintenance & Best Practices
Good habits keep your CircuPool RJ45+ running at peak efficiency while maximizing cell life and preventing scale. Build these quick checks into your monthly routine.
Routine Inspection
- Every 24 weeks in season: Verify free chlorine, pH, and salinity. Adjust output percentage as seasons change.
- Every 24 months: Inspect the cell through the clear housing (if applicable) for scale or debris. Rinse gently as needed.
- Annually: Pull the cell and flow switch for a closer look. Replace O-rings if flattened or cracked; lubricate with silicone grease.
Cleaning a Scaled Cell
If you notice white scale on the plates or rising cell voltage with low production, clean the cell. Follow the manufacturers guidance for acid cleaning ratio and method (often a 4:1 or 10:1 water-to-muriatic-acid solution). Use a dedicated cleaning stand to avoid spills, and always add acid to water, not the other way around. Rinse thoroughly and reinstall.
Water Balance Targets for Saltwater Pools
- Salinity: 30003500 ppm (target ~32003400 ppm)
- pH: 7.47.8 (expect gentle upward drift; plan weekly adjustment)
- Total Alkalinity: 6090 ppm (lower end helps control pH rise)
- Calcium Hardness: 200400 ppm (higher for plaster)
- CYA (Stabilizer): 6080 ppm for SWG systems
- Phosphates: Keep low to reduce algae pressure (optional target <500 ppb)
Winter and Vacation Tips
- Below ~602F, chlorine demand drops; consider lowering output or turning the system off if FC holds.
- In freezing climates, remove and store the cell indoors after draining. Use winter plugs and follow your pools winterizing procedure.
- For vacations, raise FC slightly and use a timed Boost the day you leave, or temporarily increase output percentage.
Troubleshooting Quick Reference
| Symptom | Likely Cause | Fix |
|---|---|---|
| No Flow indicated | Insufficient straight pipe; dirty filter; low pump speed; reversed flow switch | Clean filter; increase pump speed; ensure 1236 straight run; reorient switch with arrow to flow |
| Low salt alarm | Actual salinity below 3000 ppm; recent dilution; cold water reading skew | Test salt; add in increments; recalibrate after water warms/stabilizes |
| High salt alarm | Over-addition of salt; calibration drift | Partially drain and refill to dilute; recalibrate once stable |
| Low chlorine production | Low CYA; insufficient runtime; scaled cell; low water temp | Raise CYA to 6080 ppm; extend runtime; clean cell; increase output in cool water |
| pH rises quickly | High TA; new plaster; aeration | Lower TA gradually; use acid demand method; reduce aeration |
| Unit wont power on | No supply power; tripped GFCI/breaker; incorrect voltage setting | Check breaker/GFCI; verify timer/relay; confirm voltage jumpers per manual |
Frequently Asked Questions
Whats the ideal salinity for a CircuPool RJ45+?
Aim for salinity 30003500 ppm. Many owners target ~32003400 ppm to allow room for splash-out and rain without triggering low-salt alarms.
Can I handle 110/220V wiring of the salt system myself?
The CircuPool RJ Series control module accepts 110/120V or 220/240V, but line-voltage work must follow code and safety practices. If youre not experienced with pool electrical systems, hire a licensed electrician and use GFCI protection and proper bonding.
Where should I install the CircuPool flow switch?
Install the flow switch after the pump, filter, and heater, and before the salt cell, with at least 12 inches of straight pipe upstream. Align the arrow with the direction of water flow.
Do I need a check valve with a heater?
A check valve is recommended if you have an inline tablet feeder upstream of the cell to prevent highly chlorinated water from backing into the RJ45+ when the pump is off. With only a heater, many pads run fine without a check valve, but follow your heaters manufacturer guidance.
How do salt cell calibration steps work on the RJ45+?
With the pump running and salt fully dissolved, enter the control modules salinity/calibration menu, initiate sampling, and align the displayed reading to your trusted test value if your model supports it. Always consult the user manual for your exact button sequence.
How much salt do I need for 20,000 gallons?
From 0 ppm to 3200 ppm, youll need about 534 lbs (roughly 14 bags of 40 lb salt). Test your current salt first and adjust the calculation for your actual starting ppm.
Whats the best place to mount the CircuPool RJ Series control module?
Mount on a solid wall near the pad, out of direct spray and ideally shaded. Leave room to service wiring and keep cable runs neat and strain-free.
How long does an RJ45+ cell last?
Cell life depends on run hours, output percentage, water balance, and scaling. Oversizing the cell, keeping calcium and alkalinity in range, and minimizing Boost use can extend service life significantly.
Can I run the RJ45+ with a variable-speed pump at low RPM?
Yes. Ensure the pumps low speed still delivers enough flow to satisfy the flow switch. If No Flow appears at very low RPMs, raise the speed during chlorination windows.
Does Boost mode cost a lot to run?
Boost mode simply runs the cell at 100% for a set period. At roughly 0.20 kW, an extra 10 hours of Boost adds about 2 kWh, or ~$0.30 at $0.15/kWh, plus your pumps energy use.
Will salt damage my deck or equipment?
Properly managed salt levels wont harm pool decks or equipment. Rinse heavy splash areas occasionally and keep metals bonded to reduce corrosion potential. Avoid over-salting.
What CYA level should I use with the RJ45+?
Operate with 6080 ppm stabilizer (CYA). This reduces UV loss of chlorine so the RJ45+ can maintain FC with shorter runtimes.
Conclusion: Confident, Code-Savvy CircuPool RJ45+ Installation
With the right planning, plumbing tee and unions, safe 110/220V wiring to the CircuPool RJ Series control module, accurate salinity in the 30003500 ppm range, and careful salt cell calibration steps, your CircuPool RJ45+ installation will deliver clear, low-maintenance water season after season. Oversize for headroom, interlock power with your pump, and tune output gradually. Track chemistry weekly and use Boost only when needed. Follow these best practices and youll enjoy reliable, efficient saltwater chlorinationand a sparkling poolwith predictable startup and operating costs.
Internal and External Resources
- CircuPool Official Site product info and manuals for RJ Series
- Taylor Technologies: Pool Water Testing Guides reliable testing methods for salinity and chemistry
- Pool & Hot Tub Alliance (PHTA) Standards chemistry and safety references
- NEC Article 680 Overview electrical code basics for pools
- US DOE: Estimating Energy Use calculate kWh and operating costs