Plant Doctor Archive

Water Gardens — Sealing ponds

Question CAN I use a block wall sealant, like those available from a hardware store, to seal a concrete pond? All the pond sealants I see seem to be very expensive.

Answer  YOU get what you pay for. Proper pond sealants are Elastomeric membranes. This means that they stop water from passing through both ways, so ground water will not seep in and lift off your sealant, as will happen with a block wall waterproofing sealant.

Proper pond sealants are well worth the extra cost, otherwise you will be resealing every couple of years.

Weekend Gardener, Issue 99, 2002, Page 20