Hi everyone. I’m building my first garden pond - about 2.4m x 1.6m. Performed liner, with a Laguna Clearflo 6000 system. I’m also installing a waterfall filter. I’ve sunk the pond, and now I’m just digging to put in the filter system and the waterfall filter. However, I’m just wondering how deep I go to lay the piping from the pond filter to the pond and the waterfall filter - to try to limit icing in the winter. I’m installing valves to close the waterfall, but I’m conscious of the fact that, at some point, the tubes have to come out to go into the pond. Any advice would be really appreciated!! Thanks