1500 PPM Meter Calibration Solution General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each...

1500 PPM Meter Calibration Solution General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each...

Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different...

Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different...

Fashionable, rugged, green. The Saint Johns Explorateur Green Messenger Bag by Mercury Luggage has all the versatility you need to transport a variety of things, in a comfortable and stylish way. Designed to be rugged, ready to handle anything you throw...

This Reverse Osmosis Membrane replaces the one that comes packaged with the Hydro-Logic Stealth RO100 and RO200 reverse osmosis water filtration systems. Replacement Schedule: Replace when product water flow decreases and/or PPM increases. Directions: ...

Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different...

Maxicrop Liquid Fish (5-1-1) is made from fresh fish from the Atlantic Ocean and contains no chemical additives. It contains naturally occurring amino acids, as well as a huge complex of chelated minor elements (especially B vitamins). Many professional...

Maxicrop Liquid Fish (5-1-1) is made from fresh fish from the Atlantic Ocean and contains no chemical additives. It contains naturally occurring amino acids, as well as a huge complex of chelated minor elements (especially B vitamins). Many professional...

This KDF85 / Catalytic Carbon Filter replaces or upgrades the one that comes packaged with the Hydro-Logic Stealth RO100 and RO200 reverse osmosis water filtration systems and the Small Boy Sediment filter system. It measures 10" H x 2.5" W. Now...

This Sediment Filter replaces the one that comes packaged with the Small Boy De-Chlorinator & Sediment filtration systems. This filter measures 10" H x 2.5" W. Replacement Schedule: Replace every 3,000 gallons of filtered water, or when clogged

This Sediment Filter replaces the one that comes packaged with the Hydro-Logic Stealth RO100 and RO200 reverse osmosis water filtration systems. This filter is pleated, cleanable, and measures 10" H x 2.5" W. Replacement Schedule: Rinse with hose...