We offer two types, the Aluminum based version- Quikphos is designed for quick removal and should be disposed of within two weeks after being added. The directions suggest using 1.75oz to 50gals of water to start and then after 2 weeks you can double the quantity. Our long term remover is called SilPhos and is an Iron based media like Rowaphos. I think Rowaphos is stronger because it is a much smaller grain, the grain size of Silphos is about the size of coral sand- 2-3mm- mainly for easy handling. For Silphos they say to use 7oz to 250gal of water to start and after a couple weeks you can procede to using 28oz for 250gal of water. Both products warn to never lower phosphate below .015mg/l or coral death may result and to slowly decrease the phosphate levels following the instructed dosages. Silphos is a long term slow acting phosphate and silicate remover. I think the main difference would be cost- both phosphate removers are very competitively priced. $18.69 for (800gm)28oz of Quickphos and $31.83 for (1000g)35oz of Silphos. The main reason we came out with our own is we needed a product of suitable grain size for our cartridges 370,870 and 1670, the competitors products were too fine.