Hydro Guard HDGT-45 50 GPD Four Stage RO System


The Hydro Guard HDGT-45 by Hydronix is a 4-stage RO System offers the filtration quality of a 5 stage RO system with only 4 easy-to-replace filters. The Hydro Guard HDGT-45 is easy to install and requires no tools to change filters and features a 4.5 Gallon Storage Tank. Added benefits include Shok Blok - a system-wide protection valve designed to protect the RO system from water pressure spikes and water hammer; and Flowlok - a unique compressed filter disc that expands on contact with water, acting as a leak detector shut off valve to turn off the system when water is detected. The HDGT-45 offers a twist and lock filter system allowing for quick and easy replacements of the 4 stages that feature a 5 micron sediment pre-filter, a 5 micron carbon block, a 50 GPD RO Membrane, and a carbon post-filter. See the replacement kits below.



  • STAGE 1 – Sediment Pre-Filter (HDGT-SED5) – Replace Every 12 Months
  • STAGE 2 – Carbon Block Pre-Filter (HDGT-CB5) – Replace Every 12 Months
  • STAGE 3 – RO Membrane TFC 50 GPD (HDGT-TW50) – Replace Every 24 Months
  • STAGE 4 – Carbon Post Filter (HDGT-CB5P) – Replace Every 12 Months

1 Year Replacement Filter Kits:

1-Year Filter Replacement Kit with 50 TFC GPD Membrane for Hydro Guard HDGT-45 RO (includes HDGT-TW50 RO membrane to be replaced every 24 months)*

1-Year Filter Replacement Kit for Hydro Guard HDGT-45 RO System (RO Membrane Sold Separately)*


PDF iconHydro Guard HDGT-45 4 Stage RO System Spec Sheet

PDF iconHydro Guard HDGT-45 Service Manual