Quote Originally Posted by imagine View Post
in past concrete or cement work iv done, to waterproof i added pva to the mix, also when the cement or concrete drys it is much tougher and less likely to crack,

but if you use it find out if it is none toxic once dry, i think myself because it is hard and water tight, it wont contaminate the pond water
Cheers for that... We are mixing a waterproofing here with the concrete called Sahara..Also the final 1/2 inch will be close to neat cement with the Sahara mixed in too..
I`ll let it all cure for a couple of weeks before putting in water and then I`ll run it through the pump and filtration with loads of charcoal to get rid of the nasties..Probably for another 2/3 weeks.. Then I`ll stick the plants in and let them develop before adding fish..
Hopefully it should be OK by then..
What do you think?