I have a 3200 gallon pond. There are two pumps; Wave II 1/4HP as main and ES2500 1/15HP as waterfall.
Recently, I noticed that waterfall line stopped (no water flowing down the fall), but the pump was still running. I cleaned the skimmer basket and the leaf basket in the waterfall pump, as well as the Matala filter (3 sheets) inside waterfall tank. However, after running for about a day, water flow stopped again. I noticed that water flow pressure was lower than before.
Here is the link to the pond schematic. Please note that I replaced brush filter with Matala filter sheets in the waterfall tank.
https://kaitcilla.smugmug.com/Other/...nd/i-Qbn8dhs/A
Is it possible that there is a blockage in the waterfall line? It's a 2" line, but after the pump, it's 1 1/2".