Hello,

Hoping for some insight into a recurring metal problem.

Pool is IG 22.5k with cartridge filter. Autofill is well water through a SlimeBag Pool Filter.

Chemistry follows:
FC 2
CC 2
TA 110
pH 7.4
Cal 400
CYA 40

Weather is mid-90s and dry; we have minimal algae problems. BUT the pool 'greens up' from time to time, especially after shocking. Accompanying this is a stain, on things like our floater and pool sweep, which is a dark bronze color. Our well water is known to have mucho manganese -- 0.9 ppm if I remember right.

The local pool store has sold us Bioguard Pool Magnet. We add 2 quarts when the pool gets green, then a maintenance dose of about 1 cup per week. Seems to do the trick.

A couple of questions:

Why do I still have metal incursion?
What should I be doing to prevent it?
(Perhaps there's a 'sticky' on these subject, but I didn't see it.)

Lastly, is there a cheaper substitute for the chemicals I'm using? Pool Magnet is $16 per quart!


Cheers from the Sierra Foothills,
Paul