Red Sea Algae Control Multi Test Kit - Exceptionally high accuracy colorimetric comparator tests for the measurement of nitrate and phosphate. Red Sea's Algae Control Kit includes high accuracy colorimetric comparator tests for the exceptionally high accuracy measurement of nitrate and phosphate. The nitrate & phosphate tests are essential for the accurate dosing of Red Sea's NO3: PO4- X (biological nitrate & phosphate reducer) which is part of the complete Red Sea Reef Care Program.