Laguna Bio Sludge Control is specifically formulated to break down organic solids and pond sludge. The water treatment activates immediately when added to the pond water. A completely organic sludge remover, Bio Sludge Control is safe for fish and plants and will help improve overall pond water conditions. Size: 473 mL (16 fl oz), treats 9,460 litres (2,500 U.S. gal.) of pond water. Dosaging instructions: Shake well before using. Use 50 mL per 265 U.S. gal. of pond water (1,000 liters / 220 Imp. gal.). Use the doser cap provided for an accurate measurement. For new ponds filled with tap water, be sure that any chlorine is removed prior to adding the dose. For pond water treatment only. Store in a cool, dry place. Keep Away From Children. For optimal performance, it is advisable that any UV Sterilizer's be turned off for 12 hours after dosage.