- eliminates the most difficult limestone residues- reduces maintenance and cleaning practices by 50%- regular use preserves the product and slows down wear- one do-it-all advanced formula multipurpose solution Sicce’s pump clean is completely natural which makes it ideal for removing limescale residues from pumps, filters and all other aquarium/pond/hydroponic products that are used in close contact with water or fully submerged. 100% safe, environmentally friendly, biodegradable, green, organic powder product designed for multiple applications. Also safe for general housekeeping applications: descaler for washing machine and dishwasher - rinse aid for dishwasher - softener for washing machine - grout line tile whitening - detergent for water - natural dissolvant- appliance exhaust maintenance - cookware cleaning - rust stain removal - garment anti-felting. Contents: net wt 32 oz (900g) Instructions- 1 Quart instructions: Add 2oz / 56g of PUMP CLEAN in 1 Quart of water and mix until the solution has fully dissolved.- 1 Gallon instructions: Add 6oz / 168g of PUMP CLEAN in 1 Gallon of water and mix until the solution has fully dissolved.- Soak for 3-4 hours for DRY calcified deposits. Soak for 2-3 hours for WET calcified deposits. Use a soft brush and rinse multiple times to ensure excellent results.