Cleaning Fiberglass Pool Stains

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mikeyliny

Active member
Oct 14, 2020
37
long island, new york
I'm looking for some creative ways to clean fiberglass stains at various depths without damaging either the pool or myself. My pool installer recommended undwater abrasives like underwater sand paper, but doing this by hand will take forever.

I am thinking of some of the following with I saw here:
1. Using an air powered sander (harborfreight) with a pole attached
2. Using a gas powered pressure washer. A little concerned that the pressure might be too great and cause damage to fiberglass?
3. Using a gas powered weed eater with sand paper attached to end

Anyone have any experience doing this?
 
mikeyliny said:
I'm looking for some creative ways to clean fiberglass stains at various depths without damaging either the pool or myself. My pool installer recommended undwater abrasives like underwater sand paper, but doing this by hand will take forever.

I am thinking of some of the following with I saw here:
1. Using an air powered sander (harborfreight) with a pole attached
2. Using a gas powered pressure washer. A little concerned that the pressure might be too great and cause damage to fiberglass?
3. Using a gas powered weed eater with sand paper attached to end

Anyone have any experience doing this?
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What kind of stains? Got any pictures? Sanding the gel coat is just making it thinner and if you haven’t stopped the staining from coming back, it’ll just reoccur.
 
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mikeyliny said:
I'm looking for some creative ways to clean fiberglass stains at various depths without damaging either the pool or myself. My pool installer recommended undwater abrasives like underwater sand paper, but doing this by hand will take forever.

I am thinking of some of the following with I saw here:
1. Using an air powered sander (harborfreight) with a pole attached
2. Using a gas powered pressure washer. A little concerned that the pressure might be too great and cause damage to fiberglass?
3. Using a gas powered weed eater with sand paper attached to end

Anyone have any experience doing this?
Click to expand...
Many times sprinkling a handful of calcium hypochlorite (commonly mis-called "shock") will remove stains from fiberglass. Needs to be cal hypo, not sodium di-chlor which can also be found in bags called "shock."
 
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