Reverse osmosis system
Hydro Guard HDGT-45 50 GPD 4-Stage RO Replacement Filters
Compatible parts
Everything that fits the Hydro Guard (Hydronix) HDGT-45
Replacement filter info
Your replacement schedule
Each stage of the Hydro Guard (Hydronix) HDGT-45, the exact part that fits it, and when to change it.
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Stage 1: Sediment filter
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Stage 2: Carbon block filter
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Stage 3: RO membrane
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Alternative for stage 3: RO membrane
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Stage 4: Carbon block filter
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Kit: Filter kit, without membrane
Part YS-HDGT-45, Hydro Guard HDGT-45 RO Filter Replacement Kit, Membrane Sold Separately $69.97
Every filter except the membrane
Complete Hydro Guard (Hydronix) HDGT-45 set
Manuals & instructions
Manuals and guides
FAQ
Hydro Guard Frequently Asked Questions
What are some of the benefits and features of the Hydro Guard Reverse Osmosis under-sink system?
Super Quiet: No constant gurgling and hissing.
Delicious: Fresh, delicious drinking water right at the kitchen sink. Your household may drink more water when they have filtered, great-tasting water.
Quick Connect and Simple: The Hydro Guard system was made with simplicity in mind. The "Quick and Easy" cartridges make filter changes simple with NO tools required.
Easy Installation: The quick connectors make connecting the tubing to all the RO system parts super simple.
Peace of Mind: The Hydro Guard comes with a FLOWLOK leak detector water shut off valve. This gives peace of mind because if the system ever begins to leak--before you have a big mess under the sink, the FLOWLOK will shut the system off.
Designer lead-free faucet: System comes with a durable, great-looking faucet.
System is made with NSF certified materials: NSF International is one of the most respected independent certification organizations which rigorously tests products to comply with all standard requirements.
How do I order replacement filters for my Hydro Guard RO drinking water filtration system?
Start by clicking on the photo of your Hydro Guard system above. From there, you can add the needed filters to your cart. Filters can be ordered individually or as a "filter kit" to save you time. Keep in mind that the RO membrane usually only needs to be replaced every two years, while the sediment and carbon filters are replaced every 6-12 months depending on water usage and water quality. For this reason, you will see two different filter kits. One includes the membrane, and the other is all the filters without the membrane for year two.
While you're on the product page, you'll notice the available spec sheet and owner's manual with instructions on how to change out the Hydro Guard filters.
How much filtered water can the Hydro Guard Reverse Osmosis System produce in one day?
The Hydro Guard reverse osmosis water filter system produces up to 50 gallons of filtered drinking water each day.
What contaminants will Hydro Guard RO systems remove?
Hydro Guard reverse osmosis filters and membrane can remove common pollutants from water including lead, pesticides, sulfates, fluoride, nitrates, pharmaceuticals, arsenic, and much more. The RO system's carbon filter will also remove chloramines and chlorine.
Learn more about what contaminants can be removed with reverse osmosis filtration.
What replacement filters do I need for the Hydro Guard HDGT-45 50 GPD RO system?
How often should I replace Hydro Guard HDGT-45 RO filters?
How do I know when the HDGT-45 RO filters need to be changed?
Are Hydro Guard HDGT-45 replacement filters standard-size or proprietary?
The HDGT-45 typically uses standard 10" prefilters and industry-standard membrane sizing, but always confirm dimensions and fittings since RO systems can vary by production year or configuration.
Why is my HDGT-45 system producing low water flow after changing the filters?
Do I need to replace the HDGT-45 O-rings or other RO system parts during filter changes?
