rust sediment in pool

[PoolDoc]

Rust bacteria are not, I believe, orange. In any case, persist as orange sediment in a chlorinated pool. Please understand that iron tests (a) are often inaccurate and (b) ONLY measure dissolved iron. By definition, orange sediment on the bottom of your pool is no longer dissolved.

I am getting the impression you have never bucket tested your well water BEFORE it went through any filter or softener. Is that correct?

Also, it's typical that wells with iron contaminated water vary from time to time and season to season with respect to how much iron is present in the water.

Regarding filling -- using the polyquat and HEDP AS YOU fill, followed by trichlor tabs in the skimmer, is intended to (1) kept dissolved iron dissolve for awhile (HEDP), (2) help clump and filter the iron as it changes from soluble to insoluble forms (polyquat), (3) allow you to remain algae free while maintaining relatively low chlorine levels (polyquat), and (4) 'push' the iron to make the change from soluble to insoluble, just upstream of the filter (trichlor tabs in the skimmer).

[bellini]

Oh Ben, you are so patient with us novices. Well, would you believe that we do not have well water? It actually does come to us treated. Though, it does make sense that iron tests only measure dissolved iron and maybe that's why our levels seem low. I did do the bucket test on pre-softened water, but it did go through a sediment filter 1st - one of those that looks like yarn wrapped around a tube - which obviously gets overwhelmed quickly, hence all the sediment. Anyway, I think I will have my husband climb into the crawl space to get us some unfiltered water to do a bucket test, just to see. And in the meantime we'll keep filtering!

[PoolDoc]

Just take out the cartridge filter, run enough to purge the lines, then grab a sample, and reverse the process.

Or not.

If you have old iron lines, the situation is different. Iron can be released into the tap water continuously -- I assume your cartridge shows up orange? But, it can also be introduced in large quantities, on a no-notice basis. Among other occasions, this will tend to happen anytime the fire hydrants are used or a water main breaks . . . or even is just closed. So, depending on when you collect the sample, it may not tell you anything. The condition of your particle filter will tell you more. Orange = iron.

Also, with water lines, you may be introducing insoluble iron particles directly.

The good news is, this sort of iron can be handled even more effectively than well water simply by filling SL-O-WLY via the skimmer with the pump running. But, using HEDP and polyquat will help.

[bellini]

Thank you! Yes, we have orange filter cartridges every time. Actually our pool pump can only run for about an hour and a half before it is too clogged and orange, so we can't keep it running continuously but have to monitor it. So I think we still have a long way to go before we ever get the pool cleaned up and may not resolve the problem this pool season, but at least we have a better idea of how to fill it without causing this problem next year. Thank you!