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Stealth-RO150™ Reverse Osmosis System

  • Perfect for hydroponic gardens requiring up to 150 gallons a day of pure reverse osmosis water.

    • Produces up to 150 GPD (gallons per day) of ultra-pure, low PPM water (Flow rates of RO systems are based on source water @ 65 psi/77°/500 ppm)
    • Removes up to 98%+ of all contaminants
    • 50% water savings over similar RO filters with your choice of 1:1 or 2:1 ratios
    • The #1 selling filter in gardening and hydroponics for 10+ years
    • Membrane Power Flush Kit now included
    • Replace housings every 3 years
    • Comes with:
      • 8' length, ⅜" white inlet tubing
      • 8' length ¼" drain tubing
      • 5' length, ¼ product water tubing
    • Dimensions (H x W x D): 18.5" x 16" x 6"
    • Weight: 10.8 lbs

    Filters & Replacement Schedules

    Sediment Filter
    • Clean regularly & change annually
    Green Coconut Carbon Filter
    • Replace after 1,250 gal (Filter replacement schedules for RO carbon filters based on product water)
    ChloraShield® Filter
    • Replace after 1,500 gal (Filter replacement schedules for RO carbon filters based on product water)
    Membrane Element Filter
    • Replace between 6 months–2 years
    De-Ionization Post-Filter
    • 7,500 ppm Capacity
  • Stealth-RO150 Downloads


    HydroLogic Blog Articles

Part Number: HGC728801
UPC: 812111010713

When do I change the filter?

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The Stealth-RO150™ Reverse Osmosis System comes with the following parts


        Q: The system is brand new, why is the flow rate of purified water so slow?

        A: The system’s GPD capacity is achieved when you have the following conditions for your source water: 77°F, 500 PPM, 60 psi. If your source water is colder than this, or your inlet pressure is lower, or your PPMs are significantly higher, then you will experience less than the rated GPD flow rates. HydroLogic provides solutions to these less-than-desirable source water conditions. For instance, we have a pressure booster pump for low psi, and additional pre-filtration for high PPM.

        Q: Why has the flow rate of purified water slowed down over time?

        A: This can be due to multiple factors, such as a clogged sediment or carbon pre-filter, clogged or fouled membranes, or changes to source water conditions. The quality of your water, frequency of use, and timeliness of pre-filter changes will determine how long your system performs at peak capacity.

        Q: Why have the PPM of the purified water increased over time?

        A: This is typically due to deterioration of the membranes as a result of exposure to chlorine. The purpose of the carbon filter is to remove chlorine from the water. If it isn’t changed on schedule, chlorine will pass through to the membranes and degrade them, causing more water to flow out of the purified line and an increase in PPM.

        Q: Why is the waste line running faster than the purified water line?

        A: If you’re using the 2:1 Flow Restrictor, that means the system will produce 2 parts waste water to one part purified water. If you’re using the 1:1 Flow Restrictor, you should have equal parts waste to purified water.

        Q: Why does the waste line continue to run when the purified water line is closed off?

        A: Over time, the automatic shut-off valve (ASOV) can accumulate scale and become clogged, causing it to malfunction. If you experience your waste line continuing to run after the purified water line is closed, it is an indication of high PPM and you may need to replace it, available from your local dealer or HydroLogic.

        Q: Why is the system leaking?

        A: This can be due to various reasons, including lack of Teflon tape at threaded fittings, tubing not being pushed in all the way to the quick connect (QC) fittings, or improperly seated O-rings in pre-filter and membrane housings. It is also important to make sure the ends of the tubing have a clean cut before inserting them into the QC fittings Please call us at (888) 426-5644 if you’re experiencing any leaks.

        Q: Why did the clear pre-filter housing crack?

        A: This can be due to freezing conditions, excessive pressure spikes, or long-term exposure to high intensity lighting. Replacement housings are available.

        Q: Why is the pH of the purified water higher/lower than the source water?

        A: The pH of the purified water depends entirely on source water chemistry. Customers can experience either slightly lower or higher pH after filtration. This is completely normal for Reverse Osmosis (RO) technology. Since RO water is almost pure H2O and has no ability to buffer pH, the actual pH reading will not be accurate until you add minerals back.

        Q: Why are both the 1:1 and 2:1 Flow Restrictors included in the box?

        A: The Flow Restrictor(s) determines your waste to purified water ratio. HydroLogic has always provided two options for the waste to purified water ratio, because water conditions vary across the world; one fixed ratio would not work for every water condition.