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Thread: High FC with swg and heater

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    Join Date
    Jun 2014
    Grand Junction, CO

    High FC with swg and heater

    OK I have another question. I am a few days into the water balancing act with a new pool and currently trying to get CYA up and FC down. I've gotten the CYA from 0 to 10 in the past 48 hour and I just added more. I am going slowly because I am afraid of overshooting my goal of 60-70. The shape of my pool makes it hard to estimate gallon size but I think its between 21-24k. We are in a temporary cold spell this week so my heater is being used more. Therefore I have the VS pump running @1400 24 hours/day so the heater will work when it wants to. The factory default of the autopilot digital SWG was 50%. That took my FC to 5. I lowered it to 25% and the FC was still climbing. I lowered it to 15% yesterday and the FC is now at 8.5. The cell power level is 1. I am concluding that cannot run the pump this much. Given this info and the test results below, do you have any suggestions for timing the pump and should I raise the rpm when it's running? Will the swg and the Raypak heater automatically shut off when the pump is off or do I need to set them to do that?

    Thanks in advance.

    Latest chemistry using TF-100 kit

    Salt content- 2900
    FC- 8.5 (I cannot take the cover off the pool to drive it down because it has been near constant rain for 4 days here)
    pH- 7.5
    TA- 60
    CH- 75 (I just ordered 50# of calcium chloride flakes online)
    CYA- about 10. The lowest mark on the cylinder is 20 and I can still see the dot but it's not zero like it was a few days ago
    24,000 gal fiberglass IG pool w/ tanning shelf, Intelliflo VS pump, cartridge filter, Autopilot digital complete SWG, Pentair Easy Touch 8 automation, Raypak 400k btu heater, 3 color cascade bubblers, 1 brilliant wonders LED waterfall

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: High FC with swg and heater

    Most SWGs and all heaters have flow switches that will shut them off if no water flow is detected. I am not familiar with the Autopilot swg. My SWG is wired to its own time clock so I can set the run time independent of the pump run time. I also run my pump quite a bit more than my SWG for solar heat standby, extra leaf skimming, etc.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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