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https://www.swelluk.com:443/tetra-pond-sludgeremover/ 
Tetra Pond SludgeRemover
Tetra Pond SludgeRemover reduces sediment and accelerates the decomposition of organic substances in garden ponds for greater biological balance.
Products
Product Information
Tetra Pond SludgeRemover formerly known as SedimentMinus, has a liquid formula which acts quickly and effectively to reduce sludge in ponds, improving water quality and helping to keep the base of your pond clean.
Key Information:
- Biologically decomposes organic substances in pond water and sediment
- Prevents an excessive build-up of sediment and supports the biological balance
- Extends the intervals between cleaning the pond and filter
- Improves water quality in garden ponds
- Contains effective microorganisms
- Improves visibility in garden ponds
Dosage:
Shake well before use. Use the dosing cap to add 50 ml per 1,000 litres of pond water on a monthly basis. Overdoses are not dangerous.