Hi I have to redo my pond in the spring. Its a rubber liner and the walls
are moving in, probably not built in the best way in the first place. Where
can I look to learn more on how to properly build a pond. Second question,
What type of filter. Where can I go to read and learn about filters? I've
been using a sponge type filter and cleaning it weekly, are the biological
type better, less maintenance. Any help is apprecicated.

Hagar