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Thread: fresh fill with new pump filter sand, and SWCG system... FC is 17!

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    fresh fill with new pump filter sand, and SWCG system... FC is 17!

    Last August we bought a house in the Boston area with a 25'x50' (approx 50k gallons) painted concrete pool built in 2001. The pump/motor were shot, the plumbing at the shed was terrible, the sand filter had never been serviced and I was losing a ton of water. We replumbed, got a new Hayward Ecostar pump, changed the sand in the filter, converted to SWCG (2x Hayward Aquarite with T-cell-15) and replace all the o-rings and gaskets. The water was a fresh fill from my well.

    The pool guy came Saturday morning to finish up (replaced the multiport gasket and filter top o-ring and top off the salt - it was at 1300ppm). He tested the water before adding any chems and I had:

    FC 0
    pH 7.6
    TA 70
    CH 130
    CYA 0
    salt 1300

    I watched him slam 16lbs of CYA into a skimmer line, add another 480lbs of salt, and (I think) 8lbs of what I assumed was 68% cal-hypo. When he swept the shock it bloomed into big clouds of white. When I tested the water with my TF-100 kit Sunday morning the OTO chlorine was almost orange. DPD pegged FC at 17!

    FC 17
    pH 7.7
    TA 140
    CH 140
    CYA 45
    salt 2700

    Rechecked this morning and FC was still way up there. Leslie's pools just corroborated and said most of the other readings were suspect with that much chlorine.

    So what the heck happened to push my chlorine that high? Was it just the shock or is something else going on? With CYA at 45, and possibly more sitting in the filter dissolving, how fast can I expect the chlorine to drop to usable levels? Should I go ahead and drain a bit and refill?

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: fresh fill with new pump filter sand, and SWCG system... FC is 17!


    Are the SWGs on? If so, shut them off.

    17 FC for 45 CYA isn't really all that bad. It will be low enough to swim after a couple hours in the sun. The cloudiness should fade away. Cal-hypo tends to do that.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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