Reverse Osmosis Systems
Hydro Guard RO Replacement Filters
Find genuine Hydro Guard filters, parts, and manuals by selecting your system below
Hydronix, a reputable name in the water filtration industry, manufactures the Hydro Guard™ reverse osmsois water filtration system. The company is dedicated to delivering advanced water filtration solutions to its consumers. Incorporating innovative technology and high-quality materials, the Hydro Guard RO system is designed with easy-to-replace filters and the ability to provide premium quality water that tastes great.
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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?
The HDGT-45 uses a standard 4-stage set: sediment prefilter, carbon block prefilter, 50 GPD RO membrane, and a post-carbon polishing filter. Always match the filter size and connection style to ensure compatibility.
How often should I replace Hydro Guard HDGT-45 RO filters?
Most HDGT-45 sediment and carbon prefilters should be replaced every 6–12 months, the post filter annually, and the RO membrane every 2–3 years, depending on water quality and household usage.
How do I know when the HDGT-45 RO filters need to be changed?
Reduced flow, flat taste, chlorine odor, or higher TDS readings often indicate that the HDGT-45 filters or membrane are nearing the end of their life and should be replaced.
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?
Low flow (or slow water flow)may be caused by trapped air, incorrect filter seating, a clogged prefilter, or an aging RO membrane. Flush the system fully and confirm each filter is installed in the correct stage.
Do I need to replace the HDGT-45 O-rings or other RO system parts during filter changes?
O-rings should be inspected during each filter change and replaced if worn, cracked, or dry. Lubricate them with food-grade silicone to maintain a proper seal. We also recommend sanitizing the RO system annually when swapping filters; see the guide on how to sanitize a reverse osmosis system.
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