Undergravel Filters
I agree with Lenny. I’ve only had UGF for over thirty years.
I use a Python gravel washer to clean the gravel and suck out the waste from under the plates. One trick I use is to carefully clear the gravel around from the lift tube sockets and place the Python over them. Then I turn the water up as high as I can to pull all the waste out through the holes. Then I just replace the uplift tubes and work on the gravel.
It actually takes awhile to clean a 55 gallon tank with one of these. You won’t empty a 55 gallon setup in a minute or two. More like 20 minutes.
Category: Philippines Internet Koi Society
