Pond Force™ Pond Bacteria Cold Water Blocks LED These filters give a true

These filters give a true final polish to the water

vaults and water fill boxes for maintaining water levels in many different applications

healthy and algae-free over the long haul

100% free of lead

while biological gravel media facilitates beneficial bacteria growth

Pond Force™ Pond Bacteria Cold Water Blocks LED These filters give a truePond Force Pond Bacteria Coldwater Blocks contains strains of beneficial bacteria that work naturally to clarify water and reduce sludge. This treatment is specifically designed for spring and fall, working in water temperatures between 35 and 95 degrees Fahrenheit. Each packet treats up to 1000 gallons.