Re: white chalk on pool walls
Unfortunately a pool service company cannot help. This problem appears on all fiberglass pools in time. Initially, all swimming pool gel coat (the white or blue finish coat) is non-porous. This lack of porisity is what prevents staining at the water line and is why tile isn't needed on a fiberglass pool. The non-porous finish is why there is little to no algae, since algae must be able to cling to thrive, and why chemical requirements are greatly reduced compared to other pool construction.
With that understanding, you should appreciate the solution for you problem. When swimming pool gel coat degrades due to a combination of UV and chemically (or salt) treated water, it becomes porous and is completely worthless. This usually takes about 20 years and could be more or less, depending upon the manufacturer.
The only solution is to remove all the existing gel coat, and replace it with new gel coat. Then, no matter who manufactured the pool, it will be good for another fifteen to twenty years.
owner - swimming pool refinishing company
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