3000 gallon pond basically 8 x 10 feet, did a 20% water change, and cleaned the main bio balls filter and sponges filter.
took pond pump out of plastic cage and put on a pre-filter , twist ties on a fibre mat, tube with holes intake side of pump
added water polishing clay and Muk off tablets that absorb muck on the bottom
end of April 2017
new Aquasafe 3800 pump, new bulb uv filter, thicker barrel filter pad, pond clear in 2 days