| When adding sand to a filter you should not fill all the way to the top. I would recommend that you re-check the manufacturer directions on this, but either way i would remove some sand. Since sand filters are known to commonly get plugged from the organic debris and algae you may want to think about a cartridge filter or sock pre-filter. Another option is to use 1/2 gravel at the top and 1/2 sand at the bottom of your filter to help it to not get plugged. Either way you need to leave room in the top of the filter or the backwashing is going to flood the multiport valve and push debris under the spoke gasket and into the return lines to the pond ultimately. |
Here is a link that might be useful: Pond Filter Options
