Quote from 'Phosphate and the Reef Aquarium' by..
Randy Homes Farley, world renowned reef chemist and expert

'For those interested in knowing how much phosphorusis being exported by macroalgae, this free PDF articlein the journal Marine Biologyhas some important information. It gives the phosphorus and nitrogen content for nine different species of macroalgae, including many that reefkeepers typically maintain. For example, Caulerpa racemosa collected off Hawaii contains about 0.08 %
phosphorus by dry weight and 5.6% nitrogen. Harvesting 10 grams (dry weight) of this macroalgae from an aquarium would be the equivalent of removing 24 mg of phosphate from the water column.
That amount is the equivalent of reducing the phosphate concentration from 0.2 ppm to 0.1 ppm in a 67-gallon aquarium. All of the other species tested gave similar results (plus or minus a factor of two).
Interestingly, using the same paper's nitrogen data, this would also be equivalent to reducing the nitrate content by 2.5 grams, or 10 ppm in that same 67-gallon aquarium.'

This system also respects the Redfield ratio which is the ration of Carbon/ Nitrate and Phosphate. When the ratio of Phosphates to Nitrate is below 10 there is a likelihood of blue-green algae forming When the ratio is above 22 there is a likelihood of green algae forming

Scale.... these units are adequate for most sizes. I suggest for > 500 liters 2 exisiting units. UNITS ARE FOR SALE ON MY EBAY SHOP!

Use suckers supplied to stick inside aquarium CLEAN GLASS CAREFULLY!