My pS234 test results

[lskeate]

I have a fiberglass pool.

[Watermom]

You can't drain a pool down too far or you may have it pop out of the ground if you have a high water table. Thus, the need to do several smaller drains instead of one big one.

[CarlD]

Since your T/A is 200ppm in a F/G pool, I think you are close to done on that--anything under 180ppm you should be OK.

A CYA of 40 or 50 is great--you'll use less chlorine but it won't break down in sunlight.

TDS is nonsense 99% of the time (every SWG owner has TDS that's "too high").

And, of course, phosphates is the latest scare tactic. Only worry about phosphates when our cleanup methods don't work.

I think you are doing great!

[PhantomAndy]

You can't drain a pool down too far or you may have it pop out of the ground if you have a high water table. Thus, the need to do several smaller drains instead of one big one.

You can float the liner in vinyl pools as well. The rule of thumb with virtually all pool types is no more than 1 foot below the skimmer.

My water table is so high I never go more than a hair below the return lines (about 4 inches below skimmer level). We have a high water table here and even that's risky enough.

[waterbear]

Why would anyone recommend draining several times instead of one large time. It would require draining much more water in the long run by draining several and get same results with one large drain.

Fiberglass pools need special precautions if they are going to be drained more than about a foot below the skimmer. They might need to be braced with boards to prevent buckling or they might need to have ground water constanly pumped out from under them (the latter could apply to gunite and shotcrete pools also!)