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Algae Growth In Spa

Q:
My sovereign is only 4 months old. I have changed the water on the third month as suggested. Upon refilling the spa we treated the water for calcium as we were told that since we were on community well water, that our calcium levels would be high. This treatment was an attempt at finding the problem of why our filters were stopping up so rapidly with algae growth. The filters could not be cleaned even with an acid solution and had to be replaced. The treatment was supposed to crystallize the calcium so that we could net it at the surface if there was excessive calcium present; there was not. The result was a catastrophe. Algae began to grow on the spa in spite of repeated shock treatments. Brown spots began to grow at the top of the water level on the tile grout. The spa sales rep said only use baking soda to clean the spa with a stiff brush, but this has no effect. Please tell me if I can use something stronger that will not break down my vinyl. Thank you in advance for your expert advice.
A:
You haven't given me any specifics: What is the calcium level? pH level? Total Alkalinity? What sanitizer is being used?

The fact that the filter clogs up with algae and can't clean up with acid and that there is visible algae and other microbial growth (brown) seems to point to inadequate sanitation. You need to shock your spa and keep the level at least in the 5-10 PPM for a few days or until all traces of algae are gone. Operate filter continuously to help get rid of in the filter system.

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