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Black sealant for indoor ponds
I've seen above-ground indoor pond/waterfall constructions made entirely
with natural stones (dressed stones for the pond perimeter and rough stones for the waterfall). The stones were held together by something the colour of cement (sand mix perhaps), but the pond interior was coated in a thick black sealer (some type of tar). Ponds are in the 800 to 1200g range. Can someone identify or direct me to a source of this sealer. Is there any additives used with a sand mix to make it more fish-safe or less porous? I'm already familiar with the leeching requirements with the fresh limestone in concrete products. TIA NetMax |
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