Chofunda chopanda madzi cha bentonite chimapangidwa ndi bentonite yotalikirapo kwambiri yokhala ndi sodium yodzaza pakati pa geotextile yapadera yophatikizika ndi nsalu yopanda nsalu.
Bentonite impermeable mphasa yopangidwa ndi nkhonya ya singano imatha kupanga timipata tating'onoting'ono ta ulusi.