try googling used billboard tarps some people say they're complete crap but as long as you cover it in sand or dirt they won't leak will last a long time and are super cheap for a pond your size youl spend right around 100 bucks. they are between 10 and 20 mil but there so cheap you can buy a couple of them and just through them on top of one another but if you don't cover them in dirt it won't work to well. hope this helps.
Last edited by small pond; 03/11/13 04:42 PM.
