Newbie's green pool

[aylad]

Did you try the DE? And if so, did you see any improvement? Also, at the beginning of this thread you stated that the pool store had you using "a LOT" of cal-hypo--what's your current calcium hardness number?

Jant

[George in Georgia]

Hi Aylad -

I've yet to find the proper amount of DE or the fiber equivalent from the pool store which will not "clog" the filter. I'll continue to experiment.

Calcium hardness is reported by the pool store as 100 ppm, they cite as ideal 200 to 400.

[aylad]

Ideal calcium for a plaster or concrete pool is 200-400.
For a vinyl pool, 100 is fine--but was that a recent reading, done after the large amounts of cal-hypo that you used? As far as the DE goes, start with 1/2 cup into the skimmer and watch your pump pressure for a few minutes. If it rises to 1 psi, then stop. If you see no rise, then add another 1/2 cup, which will probably do the trick. If you get over 1 psi rise, then backwash it out and try again.

Janet

[George in Georgia]

The calcium hardness was a recent reading. I'm off to the pool store to see if they've got a cyanuric acid test kit; I'll have them test a sample for chuckles ;-)

[Watermom]

Remember that when adding DE to a sand filter, it sometimes doesn't show the pressure increase immediately, so don't add more for at least 30 minutes. If, after that time, you still don't show the 1psi increase, then add just a bit more.