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https://www.swelluk.com:443/seachem-renew/ 
Seachem Renew
Seachem Renew is an aquarium water additive that helps reduce phosphate levels in your aquarium before it can become fertiliser for algae. Use as instructed, and it yields excellent results in your tank, available at the best price from Swell UK.
Product Information
Seachem Renew, available from Swell UK, is ideal for use in systems where phosphate released from all activated carbons poses a problem. Renew is also less aggressive than carbon, making it well suited for reefs and planted aquaria. It is also beneficial for use in soft water aquariums where the pH-raising property of many carbons is not an asset. Renew will remove organics and particulates in the sub-micron range; it will also help control ammonia, nitrates, and phosphates.
Key Features:
- Less aggressive than carbon
- For reefs and planted aquaria
- For use in soft water aquariums
- Renew will remove organics and particulates in the sub-micron range
- Help control ammonia, nitrates, and phosphates.
Dosage:
Use 250 mL for each 120-160 L. Renew should be used in exactly the same manner as activated carbon. Use in a filter bag only.