The Clear Pond Sludge Buster Blocks are a blend of beneficial pond bacteria and enzymes, in a pre-measured 1 ounce dissolvable block. The dissolvable blocks are unique in that they immediately sink to the bottom of the pond to more effectively remove undesirable bottom sludge. As the Blocks dissolve, they also supply a slow-release of beneficial pond bacteria in the water to provide a number of benefits for Koi ponds and water garden ponds.
Dosing: Apply one block per 1,000 gallons of water every 2 weeks, however, if you have a heavy fish load, then apply at the rate of 2 blocks per 1,000 gallons every 2 weeks.
(Max fish load is 1 inch of fish, including tail, for every 10 gallons of water)
Made in the USA.