How Do I Test Magnesium Level On My Pool?

by James Gunter
(Neridian, MS )

I have done everything I know to do to clean pool and cannot get rid of green algae in shallow end.

Someone told me today that in could be magnesium level too high?

Is that possible?

How do I test magnesium level?

Please help...

Thanks for the question James

An algae problem is normally due to a low chlorine level. I just answered a question in this post:

Why Can't I Clear My Green/Blue Pool Water?

These are very good as well:

How To Clear Up A Green Pool In Woburn

Green Pool (Algae) Re-Occurring..Pictures

For the next part of your question:

There are actually two names: Manganese and Magnesium.

Manganese is one of the more difficult mineral pool problems. Many times it comes from well water.

Manganese will show up as a brown-black stain or discoloration on the pool.

It can be treated with a mineral treatment (chelating agent).

In simple terms, the metals bind to the chelating agent and then are eliminated.

The may sound like a metal sequestrant, but it's not, so be sure you're getting a chelating product.

Magnesium is close to calcium but is much more soluble in a pool. While it does contribute to the total hardness of the water, it doesn't contribute to staining.

If manganese is suspected, you can take a sample of your pool water to a local pool store for analysis.

I believe some LaMotte Pool & Spa water testing products can also test for manganese.

I hope this points you in the right direction.

Have a fun and safe swimming season.


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