My friend just bought a house with a pool. Pool was clear when they looked at the house but by the time they moved in it was green. He shocked it and that helped, but it was still very cloudy (3-4 ft. visibility).
18,000 gallon in-ground plaster pool with no SWG.
I took my TF-100 kit over and got these readings
I didn't get a Ph reading unfortunately. I'm also a little suspicious of my CYA reading as it seems to be reading low this year (regents are one year old) and tests from the pool store and a pool guy registered from 60-100. He has a Taylor kit on order and we'll double-check tomorrow.
He added about 4 gallons liquid chlorine to bring it up to SLAM level (we did the math on PoolMath). The next day it was down to 7 ppm. The water looked better (maybe 6 ft. visibility). Then he added another dose (same amount) this morning at 10am. 3 hrs. later it was down to 1 again (his measurement, but I'm sure he got it right).
Is it possible for a pool to drop about 18 ppm in 3 hours?
He's of course worried about whether this is working. I think the SLAM should continue. Any thoughts?
Also he's away for a month so is getting this company to take care of the pool. We got a good reference. Any one know about it? They use chlorine gas.