Hard Water stains on glass tanks...,Help!

[Ggz123]

I just bought 12 used 30 gallon glas aquariums. They are drilled and will work nicely as a system run by a single large sump. They have hard water stains I can't get out. I have tried a strong vinegar solution, Bar Keepers Friend and a razor blade. Any ideas you can share?

[White Worm]

Buff them out like you would scratches. Cerium Oxide. https://www.youtube.com/watch?v=f6-L0zvGWfY

[LizStreithorst]

I have had great success using moistened 1400 grit sand paper. It was suggested to me by a member here, I tried it and it works.

[Leland F.]

You can also you 0000 gauge steel wool. Works great on your car windshield too.

-Leland

[JamesW]

Citric acid or oxalic acid would be good options too.

[CliffsDiscus]

Lime Away

[pitdogg2]

Lime Away

All i ever use.

[Keith Perkins]

Lime Away may very well do the job for you, I tend to use something more hard core for tough lime stains on used tanks...muriatic acid. Lime pretty much dissolves or wipes away, but the trade off is you really need to use it in a well ventilated area.

[White Worm]

Yeah, well ventilated. I used muriatic acid to remove stains from my in-ground pool when I moved in. Worked like a charm.

[Davidzil]

try Bar Keepers Friend Soft Cleanser

[mee]

if the glass is not yet etched, you can use paper towels soaked in vinegar. They will stick to the tank surface, and after a night most minor deposits will melt away.