Quote Originally Posted by bjdrogo
Have a 18X38 IG concrete? pool with a Tagelus sand filter and 2 speed pump. Pool also has a bubbler spa attached. Opened it up this year to find a swamp that UFO come out of. Been hitting it with 6% chlorine everyday. Running pump 24/7 and added Muriatic acid last night. The more I read the more confused I get; I don't even think I can get back to this forum to find out if it was answered. But I am going to give it a try. Here are my testing results from this morning:
FC 2ppm
CC .5ppm
TC 2-4ppm
First, you need to raise your FC to 10-15ppm. 10 is the shock level with 0 CYA, 15 the max level for vinyl pools, UNLESS CYA is over 60.

pH 7.2
TA 340
Your T/A is far too high. Your max should be 125. You lower pH to 7.0, it drags T/A down with it. Then you aerate to raise pH to 7.3 without raising T/A. Repeat until you hit your target T/A.


Cal 280
This is fine. Calcium in a concrete pool should be between 200 and 400.

CYA 0
You need to get your CYA to at least 30. 30 to 50 is best--over 50 I believe is too high.

I am running my spa aerator and I can't remember why. I remember reading something about the aerator lowering some reading but a can't remember which one. Thank you all for what you do. Maybe one of these days it will all come together. BJ
Go to the top of this forum and read up on beginning chemistry. It should help you.