Sump cover growing mildew - The Planted Tank Forum
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post #1 of 2 (permalink) Old 11-14-2017, 06:30 PM Thread Starter
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Sump cover growing mildew

I made a cover for my sump out of some spare plywood, sprayed with Kilz primer. For some reason I thought Kilz was formulated to prevent mold growth, but I'm getting quite a bit of mildew growing on the lid. Any products out there recommended for preventing mold? Or do I need to go with acrylic/glass for my sump lid?

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post #2 of 2 (permalink) Old 11-14-2017, 10:49 PM
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Plywood even painted with Kilz or similar paint isn't ideal as a cover for a sump as it is difficult to get perfect coverage.

Another material that should work great is double wall greenhouse panel (polycarbonate) and is easy enough to cut with a utility knife to fit any piping in the sump.

Glass would work though can be difficult to fit around piping and Acrylic will bow after a few days unless you get the type that doesn't as easily. I can't remember what my local fish store is using for his custom sump lids but I'll try and remember to ask when I see him this weekend.

Update: My local fish store guy says he uses polycarbonate for lids on sumps and acrylic tanks as it won't bow, sag or deform over time.
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Last edited by deeda; 11-18-2017 at 07:00 PM. Reason: add info
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