| Hydro Guard HDGT-TW50 Twist Reverse Osmosis Membrane 50 GPD | espwaterproducts.com | 69.99 USD | 109.64 USD | −36.2% |
| Hydro Guard HDGT-FLK-PAD FLOWLOK Leak Detector Pad Replacement | espwaterproducts.com | 4.99 USD | 7.82 USD | −36.2% |
| Hydro Guard HDGT-CB5 Twist Carbon Block Filter 5 Micron | espwaterproducts.com | 23.99 USD | 31.2 USD | −23.1% |
| Hydro Guard HDGT-CB5P Twist GAC Carbon Filter | espwaterproducts.com | 25.99 USD | 32.37 USD | −19.7% |
| Hydro Guard HDGT-SED5 Twist Sediment Filter 5 Micron | espwaterproducts.com | 19.99 USD | 22.13 USD | −9.7% |
| Hydro Guard HDG-45 4-Stage Underbench Reverse Osmosis System | waterfiltersonline.co.nz | 700.5 NZD | — | — |
| Hydro Guard™ U3000-UF, Under Counter Ultra-Filtration Water Filter System | filterchoice.com | 246 USD | — | — |
| Hydro Guard 50GPD Reverse Osmosis Water Purification System With Faucet | ifilters.com | 220.71 USD | — | — |
| Hydro Guard HDG-U4000-UF Under Counter Drinking Water Filtration System | ifilters.com | 175.69 USD | — | — |
| Hydro Guard HDGT-45 Reverse Osmosis 1-Year Filter Replacement Set, 50 GPD | ifilters.com | 123.59 USD | — | — |
| Hydro Guard™ HDG-7CB5, HDG-EV9618-11, Water Filter Cartridge, Carbon Block | filterchoice.com | 105.95 USD | — | — |
| Hydro Guard™ HDG-4CB5-S, HDG-EV9617-26, Water Filter Cartridge, Scale Inhibitor | filterchoice.com | 92.95 USD | — | — |
| Hydro Guard HDG-i2000(2), HDG-EV9612-22, BGE-3200S, Water Filter Cartridge, Ice | filterchoice.com | 75.95 USD | — | — |
| Hydro Guard HDGT-HEAD Twist RO System Top Module Head – Compatible with HDGT-45BN & HDGT-45CP | ifilters.com | 69.74 USD | — | — |
| Hydro Guard HDG-45-SET (Drop In) Reverse Osmosis Filter Replacement Set | ifilters.com | 68.87 USD | — | — |
| Hydro Guard HDG-U3UF-SET HDG-U300-UF Replacement Filter Set | OEM Replacement for HDG-U3000-UF | ifilters.com | 68.29 USD | — | — |
| Hydro Guard™ HDG-BH(2), HDG-BH2, HDG-EV9612-50, HDG-EV9612-51, Follett 00130245, Water Filter Cartridge, Carbon Filter and Scale Inhibitor | filterchoice.com | 66.95 USD | — | — |
| HDGT-ALK | ifilters.com | 66.21 USD | — | — |
| (2 Pack) Genuine Hydro Guard HDG-CB6-14/2 - CB6 Carbon Block Water Filter For MP Systems | ifilters.com | 57.38 USD | — | — |
| (6 Pack) Hydro Guard HDG-P117/6 Premium GAC Water Filter Cartridge - Interchangeable with AP117 | ifilters.com | 36.72 USD | — | — |
| Hydro Guard HDG-CB-AC10 Carbon Block Pre-Filter for AC30 AC15 Systems - 4 Pack | ifilters.com | 36.15 USD | — | — |
| Hydro Guard HDG-CB6-38 Carbon Block Water Filter Replacement, 3/8" NPT Port | ifilters.com | 32.65 USD | — | — |
| (4 Pack) Hydro Guard HDG-P117 Aqua-Pure AP117 Cuno Compatible GAC Water Filters Premium Carbon | ifilters.com | 28.25 USD | — | — |
| Hydro Guard HDG-TFM36 - 36 GPD Reverse Osmosis Membrane Culligan AC30 AC15 Replacement | ifilters.com | 22.95 USD | — | — |
| Hydro Guard HDGT-CB5 Carbon Block Replacement Pre Filter for HDGT-45 Systems | ifilters.com | 21.18 USD | — | — |
| Hydro Guard HDG-CB-AC10 Carbon Block Pre-Filter for AC30 AC15 Systems - 2 Pack | ifilters.com | 18.4 USD | — | — |
| (2 Pack) Hydro Guard HDG-P117/2 Universal GAC Water Filter Cartridge Compatible with AP117 | ifilters.com | 18.39 USD | — | — |
| Hydro Guard HDG45-10BODY Replacement Housing for Hydro Guard Drop In Style HDG45 RO System | ifilters.com | 17.64 USD | — | — |
| (4 Pack) Hydronix HDG-SED-AC5/4 Culligan Compatible Sediment Water Filter For AC30 AC15 Systems | ifilters.com | 15.36 USD | — | — |
| Hydro Guard HDGT-SED5 Sediment Replacement Filter for HDGT-45 Systems | ifilters.com | 14.11 USD | — | — |
| Hydro Guard HDG-CB-AC10 Compatible with AC30 AC15 Systems Carbon Block Water Filter | ifilters.com | 7.02 USD | — | — |
| Hydro Guard HDG-SED-AC5 Compatible with AC30 AC15 Systems Sediment Water Filter | ifilters.com | 5.3 USD | — | — |
| Hydro Guard HDG-005 Replacement O-ring for Hydro Guard Drop In Style HDG45 RO Housing | ifilters.com | 2.64 USD | — | — |
| Hydro Guard HDG-012 Filter Wrench for HDGT-45 Twist Off and HDG-45 drop In RO Systems | ifilters.com | 2.64 USD | — | — |
| Hydro Guard™ HDG-4C Cartridge, HDG-EV9601-00, HDG-EV9600-00 | filterchoice.com | 0 USD | — | — |