HydroLogic Stealth 100/200 RO Membrane Hydroponics Optimized Time Control: It features

Optimized Time Control: It features 'On' time that lasts up to 30 minutes and an 'Off' time that lasts up to 60 minutes

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We also carry 4 7/8 and 5 1/4 inch depth filters

The LCD screen clearly displays information with measurements in liters or gallons

HydroLogic Stealth 100/200 RO Membrane Hydroponics Optimized Time Control: It featuresReplace membranes when product water decreases and or ppm increases. Merlin Garden Pro and Evolution RO1000 membranes reduce 94%+ of total dissolved solids. Stealth RO100 200, Stealth RO 150 300 and microRO 75 membranes reduce 98%+ of total dissolved solids. The Evolution RO1000 and Merlin Garden Pro systems need two (2) membranes.