Forum Title: What to do to prevent ammonia issue next spring?
Just opened my pool. Water didn't look horrible, but there was a bit of algae and a TON of earthworms (definitely didn't have that on last year's opening). Our winter here was all over the place, from below freezing to 4-70 or more degree days in Feb. CYA on opening was 0. I'm almost certain I have ammonia, because I can't hold a FC level and CC's are higher than they've ever been (5.5). Pouring jug after jug of 10% bleach in after each chlorine test. UGH. I asked about minimum CYA to slam Minimum CYA to slam? Did as advised, so now CYA is 30, trying to slam at 12 FC but it doesn't hold. Rechecking and adding bleach several times a day. I am going to buy an ammonia test kit tomorrow, but from reading other threads, ammonia must be the problem. (Now that I got all the winter detritus out of pool, water is clear and sparkly).My question: how can I prevent this from happening again next year?? I have a SWG, so have to keep CYA ~60-70. But I live somewhere where you have to winterize the pool. If I have to go through this again next year, I will scream.
Category: pool Post By: BRITTANY BATES (Naperville, IL), 02/04/2019

Next time don't add CYA. If you have ammonia is will be neutralized faster if no CYA is present. Then you just SLAM at 10-15ppm FC. There's no reliable way to predict when CYA will be converted to ammonia as it requires the presence of certain bacteria in the water. The presence of debris and earthworms tells me your pool got really dirty. A green/dirty pool is more likely to see ammonia issues. Sent from my iPhone using Tapatalk

- FREDERICK LYNCH (Lauderhill, FL), 03/29/2019

My question: how can I prevent this from happening again next year?? Click to expand... I do feel those in the north can to some degree avoid ammonia by ensuring they close with adequate free chlorine, closing clean and cold, and opening cold. Eg take the pool to slam level, let drift down a day or two, then close/cover. If you open while water is in 50s, you will normally still have FC value. The conversion only happens after FC has zeroed out. If you open with a residual FC, you are highly unlikely to have it. While ammonia is one thing that causes the behavior you're seeing, I have a reasonable suspicion that excess antifreeze also causes similar symptoms for those in the north who close. If you use antifreeze when you close, always filter to waste to pump it off for a few minutes on opening. Just wanted you to know there could be an alternate thing at work.

- CARL P (Mesa, AZ), 03/28/2019

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