Posting for future concrete tank/pond builders.
Have a look at permanent PVC formwork for a DIY concrete tank. It's already waterproof.
Example https://www.dincel.com.au/
There should be similar products in your countries.
Have a look at permanent PVC formwork for a DIY concrete tank. It's already waterproof.
Example https://www.dincel.com.au/
There should be similar products in your countries.
