Clears murky water and eliminates bottom sludge. Coldwater Blocks are recommended for water temperatures down to 35 deg F. Also works in water temperatures up to 95 deg F. Helps jump start your pond in the spring by adding beneficial bacteria and removing decaying matter.
Creates an ideal habitat on the bottom of the pond by providing essential minerals including calcium, magnesium and other trace elements for improved bone and scale growth of Koi and Goldfish.