When organic matter decays, phosphates are released into the water and can cause undesirable algae as well as inhibit the growth of hard corals. Test as needed.

Kit includes:

• 2 x PO4 (10 ml)
• 1 x PO4 (10 ml)
• 1 x Pipette
• 1 x Glass test tube 
• Instruction booklet
• 75 tests