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https://www.swelluk.com:443/aquarium-systems-re-fresh-250ml/ 
Aquarium Systems Re-Fresh 250ml
Aquarium Systems Re-Fresh adds beneficial bacteria to help clear water, algae and cyanobacteria!
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Potent combination of beneficial bacteria that work together to maintain clear water, clean aquarium surfaces and eliminate unpleasant odours. Re-Fresh revitalises green or brown aquarium water and keeps your water crystal clear! Keeps surfaces clean and maintains water clarity.
Re-Fresh can be added anytime algae or cyanobacteria start to appear.