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My FC fell 3 ppm overnight from 29 ppm to 26 ppm. I went back up to 29 ppm before leaving for work at 8. When I got home I fell down to 12 ppm (with rain today)... What should I do next? I'm leaning toward replacing some water, but want some advice.

It was an electronic test with a computer printout. I attached the results. What do you think? The black dot test had me around 50... but maybe I wasn't doing it correctly b/c it is tricky.

Should I dump water to lower it to 50ish?

Just took my test to the store for a sample and CYA came back at 79... Should I dump some water to lower it? Will that help with my problem?

I just dumped 7 gallons of bleach in the pool to try again. That should get me above 20 ppm. Thanks for your help. I really appreciate it. This is just frustrating. I had this problem all the time before going to the BBB method. When I got a new liner last summer I switched to BBB and had...

No. The CYA was low, so I added stabilizer.

Oh - now swimming today (too cold in Pennsylvania). It has been really cloudy all day, but no rain.

Now the FC using the OTO drops is down to 0.5. PH is 7.2. So we dropped from 5 to 0.5 in about 2 hours. Any ideas what I should do? I'm afraid to start the shocking sequence again, because it will drop below shock level while I'm at work tomorrow. I'm spending a small fortune on bleach!

I retested CYA. It still looks like 50 to me... I then checked with a test strip for a ballpark estimate, and it came up "low." I tested the tap water, and I could see through to the bottom.

Okay... I did my readings every 1-2 hours last night. I stayed above 21 ppm. Before bed I was at 22 ppm and this morning I was still at 21 ppm. I went up to 22 ppm before leaving for work at 8 am. By 4 pm when I got home I was down to 3 ppm. What is going on? I don't want to do this all...

I started using the BBB method last year and had no problems. This year is a different story. I've been fighting my pool since I opened it three weeks ago to maintain a FC reading. I am trying the shocking method right now described on this website, but don't know if it will ever work! I...