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Pool Filter Washes Out Blue ?


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We had a problem with staining from metals....Pool expert said it was from the copper in the heater (we recently rennovated pool and the builder installed a salt system and a new heater). Pool expert said I let the pH get too high and there was too much chlorine which caused the staining. He repaired all damage.

However, after he was done I couldn't get the pool filter clean enough to keep the pressure down. So finally I caved and bought a new filter.

Everything has been going fine for the last month, until a week ago, during normal monthly maintenance, I added a half bottle of stain control (sequesterant). This week the pressue shot way up, the motor started whining...

I just took the filter out to clean it. The water washes out blue.... I did get it sparkling clean (just using water). The pressure did not drop, however....

IS the blue-ness from metals in the water (like how copper corrodes blue-ish)? Am I having a problem here? Since the problem was corrected I have kept the chemicals very nicely. The pH shot up before I did the chemicals last week, but it couldn't have been up more than a few days as I have been doing the chemicals weekly or even more often. I tested the water 3 days ago and everything was on target.

Thanks for any advice.....

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