From a prior thread wrt wallboard as a source.

Here is an aggregate list of links on the wallboard subject just for all you link lovers.

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=20;t=002752

Gypsum can be purchased in the form of sheetrock wall board. Most all home improvement stores have it. Do not use the pink colored type and try to be sure there are no added fibers as binders. It can be broken up and ground to small pieces and put in. The way to find out how much is to take a water sample in a jar --say a quart --measure out small amount of ground up gyp. measure it and add to see when it clears. Then do the calculations to see how much for the vol of the pond. Read these esp. the last one. Good luck.

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=16;t=000073

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=16;t=000066

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=16;t=000068

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=16;t=000049

Last edited by ewest; 04/05/10 08:56 AM.