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Toby Any more details ? at the end of the day no point to improve the "waterproofness" of the concrete if you have issues with porosity, construction joints and so on ... concrete by its nature is permeable but you can very much improve that in the mix and placement and in the joints without special products.
Cheap and easy is waterbars on the joints, an improved density mix and when all else fail a flintcote (or similar treatment, even bitumen outside face) in multiple and minimum 3 thick layers brushed at 90 degrees on each consecutive coat

If you can give more details of the issue (waterproofing, impermeability, etc) and the materials (ie a dirty sand or gravel will add to problems) there are likely simple and low cost local solutions - its not a new problem. Simple question is it a water tank or a septic tank as the solutions are different.....

Best .. Chris

Toby Any more details ? at details? At the end of the day no point to improve the "waterproofness" of the concrete if you have issues with porosity, construction joints and so on ... concrete by its nature is permeable but you can very much improve that in the mix and placement and in the joints without special products.
Cheap and easy is waterbars on the joints, an improved density mix and when all else fail a flintcote (or similar treatment, even bitumen outside face) in multiple and minimum 3 thick layers brushed at 90 degrees on each consecutive coat coat.

If you can give more details of the issue (waterproofing, impermeability, etc) and the materials (ie a dirty sand or gravel will add to problems) there are likely simple and low cost local solutions - its not a new problem. Simple question is it a water tank or a septic tank as the solutions are different.....

Best .. Chris