Can't keep chlorine in my pool

[PoolDoc]

If you haven't added copper, I think it would be very unusual to see copper in well water with iron.

Iron can come out of the water VERY quickly.

I'm curious: if you've been running the pool for 8 years, why are you having trouble keeping chlorine in the pool THIS year?

Regardless:

1. Please fill out your forms; it makes it easier for us.
2. Test for chlorine demand by adding -- in the evening -- 2 gallons of plain 6% bleach per 10K gal of pool water (12 ppm FC).
3. Test your chlorine level 1 hour after dosing, and then again in the morning before 9 am.

If you've lost much chlorine, there's something in the water that has be chemically burned up (oxidized). The best way to do this is to add chlorine in the EVENING, so it doesn't get used up by sunlight.

4. Get a K-2006 testkit (or a HTH 6-way drops kit, if your Walmart has it). Both are Taylor kits; both give reasonably accurate stabilizer tests. IF step #3 doesn't show a significant chlorine demand, and IF you really have CYA=45, then you shouldn't be losing all that much chlorine during the day.

[jgfranklin]

I have had this problem before. One time it was because I had phosphates in the pool. Another time I believe I didn't have enough cyanuric acid. But this time the CYA level was not in question at least that is what the data is showing and the phosphate test was negative. I did try to find the test kit in Target but they don't carry it...so I will try Walmart tomorrow.

I just put in 6 gallons of 6% plain bleach and will test in an hour like you suggested. I will leave pool pump on all night and test in the am.

[PoolDoc]

You can check Walmart's site for the HTH 6-Way Test Kit and see if it's available locally.