Dr Tims Refresh 240ml 8oz Treats 1,817 litres Aquarium 120ml 4oz Treats 900lt. Dr Tims Re-fresh is ideal for tanks having issues with organics and cyanobacteria. Dr Tims is a all natural answer to eliminate green and brown grunge and cyanobacteria. Dr Tims Refresh Description: Treat Brown/Green Aquarium Water - Use Re-Fresh to Preserve Clean Water in Your Tank Eliminate Cyanobacteria Re-Fresh fights algae and slime naturally, while being non-harmful to plants. Re-Fresh for Brown/Green Water Revitalizes old, green/brown water Preserves clear water Keeps water odor free Reduces organics Use frequently to maintain sparkling water 100% Natural No one wants an aquarium covered in green or brown grunge that smells. But many people do not want to add toxic chemicals to their aquarium either. The answer is DrTim’s Aquatics Re-Fresh. This 100% natural product is a potent mixture of beneficial bacteria that work to eliminate green and brown grunge in your water and on surfaces in the aquarium.