Ok, so I have a 18x33 AG, Sand Filter pool. I have been battling green for weeks trying to start up. I have thrown tons of money at this thing and now my levels are way off after listening to the pool store! HELP!!!
CYA 90
FC 15
pH 7.7
Copper 1
I'm still green, but the pool store thinks its the copper from all the algaecide I threw at it. I assume I need some Chem Out to neutralize the chlorine. /QUOTE]
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Your FC for that CYA is barely at MAINTENANCE level! To shock you'd need to get to ~40, and KEEP it there. Look at
Pool Water Chemistry
Your CYA is high enough to make the pool hard to maintain. Target is 30-50. Any solid Cl will add CYA.
The green is algae. The green is algae. The green is algae.
Go read the pool school pages when you get a chance.
The first decision is whether you want to try to maintain at that high CYA level or drain half the water and refill.
Then you need to keep the FC level at shock levels (With ONLY
liquid chlorine- NO PUCKS, no trichlor, no dichlor!!) till all the green is gone, and the chlorine CC is <0.5, and FC level has minimal overnight drop. ="SLAM"
Look at poolmath. A gallon of 10% hypochlorite will raise your FC about 9 ppm. Without a drain/refill to lower CYA, you need to add 2-3 gallons right now.
IMHO, stop listening to the high school kids at the pool store. You'll soon know far more than they do.
Good luck, Jim.....
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And get a solar cover.