Phosphorus ( P ) is one of the main three macro nutrients (nitrogen, phosphorous, potassium: NPK required by plants and can often be overlooked in a planted aquarium. It has been inaccurately thought to 'cause algae'. Full 3x per week dosing with LCA Phosphorus will enhance and support colouration in plants , allowing deeper greens and richer reds.INSTRUCTION: Dosage rate for 100L TankSHAKE WELL BEFORE USEUse 1 pump (2ml) per 100L, 3x per week with 50% weekly water change. • For HIGH LIGHT tanks with injected CO2, dense plant mass and good flow - instead use 3 pumps per 100L, 3x per week (maximum dosage) with 50% weekly water change.• For LOW LIGHT tanks, dose the normal amount but only 1-2 times per week.'*Amounts above are for reference only. Your planted aquarium may need more or less depending on many factorsWARNING: 3 PUMPS PER 100L IS THE MAXIMUM DOSAGE. DO NOT OVERDOSE