| I would be thinking about pouring a bottom then using some type of motor product over the top of the block. I've applyed SureWall (for other uses), very easy to apply and cheap. Then seal with a concrete sealer or use many of the waterproofing or pool paints. If it works for pools?
Flex PVC, black, white, or beige are all the same except color, the plumbing codes call for certain color based on applications. At least that is what is published from the one manufactor of flex pvc. |