Lawn Fountain

Posted this in Home repair. Not sure if this might be a more appropriate NG..?
Just moved in. Have a large in-ground, 3-pond water fountain. Each pond is made up of a stone rim and pebble -concrete base. It apparently hasn't been active for a few years. Once I got it cleaned out, I filled all the ponds with water. They didn't hold water overnight. There are not any obvious cracks, holes,etc. I suspect the concrete is porous. Is there any solutions such as a sealer that can be sprayed or painted on the concrete base?. Was thinking of Dri-loc (or something) for basement wall leaks...but think that would not look right. Aside from completely rebuilding the ponds with the proper liners...any thoughts?? Thanks Bg
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I'd try going to a store that sells pond supplies, accessories, etc and asking them.
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