GroLine Monitor for Hydroponic Nutrients with Inline Probe open sesame soft rock phosphate should be

soft rock phosphate should be mixed into soil or compost prior to planting

All of Active Aqua's submersible pumps include multiple hose fittings so you get an exact fit every time

or mixed into compost tea

Instructions for use:

Hinged lid for easy filling

GroLine Monitor for Hydroponic Nutrients with Inline Probe open sesame soft rock phosphate should beThe HI981421 GroLine Monitor for Hydroponic Nutrients provides around the clock, continuous monitoring of pH, conductivity (EC & TDS), and temperature in hydroponic nutrient solutions. Quick to setup, simple to use, this monitor was designed with Hydroponics, Aquaponics, and Greenhouses in mind. Make your nutrient solution easy to manage with the GroLine Monitor. Get 24 7 pH&EC measurements for consistent yields every time. Good Laboratory Practice