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10% Hth - 2017 lot from Ace Hardware. I tried to find out from Hth what their stamp code means, but they weren't very helpful. There were boxes there that said both 1617 and 1717 on them, so I'm only buying the 1717. I've also purchased 10% from the pool store (same price as ace - about...

How often are your testing and adding bleach? Sometimes hourly, sometimes longer, depending upon results. What is your CYA and what are you using as your FC target? 35 - 40 - using 16 as the FC target What was the kind of sand that you put in your filter? Was it regular pool sand grade...

Ugh! Still cannot pass the overnight test. I've re-tested CYA and I am SLAMing in the right levels. Sometimes I get .2 or 0 cc, and water has been crystal clear for days on end. Is it possible there could be crud somehow stuck in the impeller? We had the sand replaced in the filter this...

Congratulations! I have yet to pass that darn overnight test! The pool has looked beautiful for a week now, but chlorine still sinks overnight. So glad to hear there is hope from someone who ended up so deep into this process! Our of curiosity did your CYA sink during this process? (Edited...

That's what I've heard :/ Here is the older post for grins. https://www.troublefreepool.com/threads/22821-Aeration-eating-chlorine

Water is crystal clear - I could read the date on a dime in the deep end (if my eyes weren't so old - ha!) A thought: Has anyone noticed a difference in OLCT with pump running vs off (still water) overnight? According to older post, both aeration and agitation accelerate chlorine gas off.

I know SLAM rules say overnight test has to result in 1PPM or less FC loss overnight, but I was aerating and my overnight loss was 1.5, but CC is holding steady at .2 - almost not readable, and my Ph is now 7.4 and Alk 120. Woot! This might seem foolish, but I think I'm going to call this SLAM...

I think testing every 30 minutes might not give the best results - seems like SLAM instructions say no more often than 60 minutes... but I understand your desire to do it non-stop!

I seriously lost count, but my best guess in looking at the container carnage I have here now (garbage went out Tuesday with the first wave) is at least 45+, in addition to 5 bags of cal-hypo at the beginning. You have me beat, for sure, but I also didn't have a green pool, and my pool is half...

Happy to provide encouragement! Here is the link to my thread in case anything in that is of interest to you. I really was in complete amazement over how much shock I put into the pool and ended up with NOTHING in a very short period of time (and my pool wasn't green - just milky hazy)! When...

Thank you for sharing that link! I'll be following his saga!

So sorry you're dealing with this! I've been going through something very similar -- I cannot BELIEVE how many gallons of 10% I've used! I noticed my CYA (which has been historically 70-80) is now suddenly quite low. There are threads about how CYA can be degraded by bacteria and then you end...

Thanks for the link, but my pool was never green. It's beautiful and clear now but just had nitrates tested at Petsmart and according to the test strip, 15-20%. It is so interesting to me that my CYA has been eaten up, so there probably is something to the info in an older thread about...

Yes, I found some old, very technical threads about CYA being converted by bacteria growth in this forum. Maybe this "first world problem" of running out of chlorination has done me a favor in the CYA department! I guess we shall see if the old levels seem to return after I reach a more...

Yep. Yep. Yep. Hahaha!

I just saw another thread on the proper way to test CYA in the sun. I figure I have about 35 or so, which means I should have only SLAMmed to 16. Egad! I hope the chlorine comes down a bit more before the sun does! (Edited - just checked it again - down to 17.5 - getting closer!) Still...

Hi all - I was looking for a little confirmation on my process and made the mistake of going to a local pool store. They freaked me out about my high chlorine levels, but I'm sure folks here will help me chill out! We left the pool for a week and apparently didn't leave enough pucks in the...