Phosphate test kit from Nutrafin.
For fresh & saltwater.
Full complement of test equipment: test pipette; glass test tube and cap, lab base, instruction booklet.
Regular testing is required when tap water contains phosphate as well as in aquariums with natural decoration which can decompose and result in accumulation of phosphate.
Phosphate is a major nutrient for all plants, regular testing is recommended for aquariums that experience excessive algae growth.