The Crystal Quest Guardian Whole House Water Filter is a point-of-entry filtration system built for homeowners who want high-capacity, carbon-based multimedia filtration across the home. It is available in 1.5 cubic foot and 2.0 cubic foot media configurations, with listed capacities of 1,000,000 or 1,500,000 gallons depending on the selected size. The Guardian uses a three-stage process with premium and catalytic coconut shell granular activated carbon, Eagle Redox Alloy 6500 media, and a replaceable 5" × 10" carbon block cartridge. It is designed for residential whole-house use, with service flow ratings of 9-11 GPM for the 1.5 cubic foot system and 10-13 GPM for the 2.0 cubic foot system. Buyers can choose the standalone Guardian filter or add the optional salt-free conditioner for scale-control support without a brine solution.
The Guardian system is designed to filter water at the main line before it reaches faucets, showers, laundry, and household fixtures. This makes it a practical fit for homes that want centralized filtration instead of relying only on point-of-use filters.
Water travels through premium and catalytic granular activated carbon, Eagle Redox Alloy 6500 media, and a 10" carbon block cartridge. This staged design supports reduction of listed contaminants when present in the water, including chlorine, chloramine, heavy metals such as lead and mercury, VOCs, herbicides, pesticides, and petroleum or pharmaceutical by-products.
The 1.5 cubic foot Guardian system is listed for 1-3 bathrooms and 9-11 GPM service flow, while the 2.0 cubic foot version is listed for 2-4 bathrooms and 10-13 GPM service flow. This gives homeowners a manufacturer-listed bathroom-count guide for choosing between the two capacity options.
The Guardian can be ordered as a standalone whole house water filter or with an optional salt-free conditioner. The conditioner uses anti-scale media and does not use a brine solution, making it a separate upgrade for customers who want filtration plus scale-control support. If water hardness is 25 GPG or higher, Crystal Quest recommends speaking with a water specialist.
The Guardian is built for homeowners who want a filtration system with manufacturer-listed 1,000,000 or 1,500,000 gallon capacity options. Its fiberglass tank design and carbon-based multimedia filtration stages make it a practical option for residential point-of-entry water treatment.
Select the 1.5 cubic foot or 2.0 cubic foot configuration based on household size, service flow needs, and bathroom count. Optional salt-free conditioning should be chosen based on water conditions and installation goals.
Need help choosing the right Guardian configuration?
TrueStead Supply can help you compare capacity, bathroom count, flow rate, and optional conditioner upgrades.
✓ Whole-house filtration support
✓ 1.5 or 2.0 cubic foot media options
✓ Optional salt-free conditioner configuration
| Brand | Crystal Quest |
| Series | Guardian Series |
| Product Type | Whole house water filter |
| Configuration Options | Standalone or add salt-free conditioner |
| Filter Media Volume | 1.5 cubic feet or 2.0 cubic feet |
| Capacity | 1,000,000 gallons or 1,500,000 gallons |
| Home Water Usage | 1-3 bathrooms or 2-4 bathrooms |
| Service Flow | 9-11 GPM or 10-13 GPM |
| Tank Dimensions | 10" × 54" or 12" × 52" |
| Tank Material | Fiberglass |
| Flow Design | Upflow |
| Carbon Block Cartridge | Replaceable 5" × 10" carbon block cartridge |
| Working Pressure | 30-60 PSI |
| Operating Temperature | 40-100°F |
| Replacement Media | Guardian Multimedia, CQE-RM-05041 |
| Replacement Cartridge | Carbon Block Cartridge, 5" × 10", CQE-RC-04035 |
| pH Range | 7-11 |
| Installation Use | Indoor potable cold-water line only; protect from elements and freezing |
| Max Hardness | 75 grains per gallon; speak with a water specialist if hardness is 25 GPG or higher when selecting the salt-free conditioner |
| Pretreatment Note | For optimal results, remove iron, manganese, sulfur, and tannins before installing this system |
| Optional Add-Ons | Salt-free conditioner, 12 GPM UV Water Sterilizer, Leak Detector Valve, Vacuum Breaker, Metered Valve, Oxidation System; availability may vary by selected configuration |
