In case anyone wants to know what is in the sludge remover:
Description:
As soon as sludge and slime begin to take hold of your pond or fountain, don’t wait to act. Use our Total Pond Sludge Remover in the 16 oz. bottle to eliminate gunk and goo and rescue your water garden. Sludge can rapidly build up and make both big and small ponds unappealing. Sludge also builds up on filters and makes them less efficient. A 16 oz. bottle of Sludge Remover will treat up to 960 gal. of water. This product is intended for use in self-contained ponds and fountains that have no outflow. Follow instructions on label and use only the suggested quantity for your pond or fountain. If you use an ultraviolet clarifier in your water garden, turn if off before adding Sludge Remover and keep it off for 5 days after application. We also offer our Sludge Remover in large 64 oz. containers. For best results, use with our Water Clarifier.
Well I thought that would be more informative. I will take a pic of the back of the bottle. It is a shit load of micros and bacteria that eat decaying organic matter.