Iron in water source

[BigDave]

... will have NO EFFECT on the algae, until your PO4 levels become lower than 0.25 ppm (250 ppb), and won't be fully effective till you have less than 0.1 ppm of PO4 present...

I was still getting mustard algae at 250ppb. It didn't stop until I got the pool under 125ppb.

[FormerBromineUser]

Any updates?

[stcohen]

Pool looks like first pic, BLUE. Used flocculent and vacuumed to waste Fri. & Sat. Fill water now softened. Cleared Fri. and sparkling by Sun. Labor Day at the pool planned as supposed to be 93 here today. Old bathing suits as running FC > 5, < 10 with CC 0.4. Phosphate testing kit should arrive tomorrow. I will post level.
Thanks again for your support!

[stcohen]

The pool remains blue and clear. Did use flocculent again and vacuumed to waste. Very little, but some, algae fell out and was vacuumed out of pool.
Phosphate kit arrived, > 1000 ppb in the pool. Ground water must also have phosphates as "softened well water" also has > 1000 ppb. Plan to control algae with FC for the remainder of the month as I am reluctant to cloud pool with treatment since we can finally use the pool. Seems like it will be a vicious cycle with the source water as it is.

[PoolDoc]

Try using very small doses of the phosphate remover, added at night. Make sure the pump is running. In at least some cases, the pool will clear fully overnight. If you use a small dose, even if this doesn't happen there won't be enough cloudiness to be an issue.

Caution: phosphate remover should ONLY be added when the filter is clean enough to allow the pool to operate for 3 - 4 days without cleaning the filter. Otherwise, you'll likely lose some of the phosphate remover uselessly.

[FormerBromineUser]

See you on-line. Any updates?

[stcohen]

Closed and covered pool last week-end. Water was crystal clear. I spent a couple weeks getting the phosphates out before I covered it. Looking forward to an easier season next year. Thanks for all the assistance.