Fosfo is a concentrated phosphate source for aquarium plants.Daily dosage:10 ml per 500 litres raises the PO4 concentration by 0.1 ppm or 0.1 mg/l.For our full range, see our website at http://seasideaquatics.co.uk. For our range on eCRATER, see our shop.If there are any problems with on delivery, send a photo and a full description of the problem within 12 hours of delivery. We recommend that photos are taken on a white background, for example on a white towel or a sheet of paper.