Water Doctor Guardian | Protects Appliances & Equipment from Sediment | Customizable Pre-Filter Systems

What this product does

Your point-of-entry firewall. These housings hold high-capacity cartridges to:

• Capture sediment (sand, silt, rust) and protect UV, softener/descaler, heaters, and appliances.

• Improve taste & odor when paired with carbon (reduces chlorine; some carbon types also reduce chloramine).

• Enable UV by lowering turbidity before disinfection.

In the box: Housing + filter wrench.
Cartridges sold separately — choose Sediment or Carbon (or Specialty) based on your water.

How to choose your size (at a glance)

• Small condos/townhomes (≤2 people, 1 bathroom, light use): 10" Standard or 10" Big Blue

• Most single-family homes (3–5 people, 2–3 bathrooms): 20" Big Blue (single or Double)

• Higher flow / multiple baths / well water: 20" Big Blue Double (B2) or Triplet (B3) for staged filtration

• Prefer visual checks: choose a CLEAR model (10BC / 20BC) to see cartridge condition

Rule of thumb: Bigger = lower pressure drop & longer life. If you run UV, softener/descaler, or iron/tannin systems, go 20" Big Blue or a staged setup.

Recommended cartridge types

• Sediment (1–50 μm) — PP melt-blown or pleated. Popular staging: 20 μm (coarse) → 5 μm (fine).

• Carbon (Block / GAC) — taste & odor, chlorine; some blocks target chloramine.

• Specialty (in multi-housings) — KDF/metal-reduction, scale inhibitor, lead-reducing carbon, etc.

When to replace: sooner if water is dirty/colored, taste/odor returns, or pressure drop increases 10–15 psi.

Model lineup & differences

WF-10 — 10" Standard Housing (WITH WRENCH)

• Cartridge size: 2.5" × 10"

• Best for: Small spaces, POE protection for condos/suites, localized lines

• Typical use: Single Sediment (5–20 μm) or Carbon

• Typical replacement: Sediment 3–6 mo · Carbon 3–6 mo (smaller volume = shorter life)

WF-10B — 10" Big Blue Housing (WITH WRENCH)

• Cartridge size: 4.5" × 10"

• Why upgrade: Larger diameter → higher flow & longer life vs WF-10

• Best for: Small homes / compact POE

• Typical use: Single Sediment or Carbon

• Typical replacement: Sediment 4–9 mo · Carbon 6–9 mo

WF-10BC — 10" Big Blue CLEAR (WITH WRENCH)

• Difference: Transparent sump for visual monitoring

• Install note: Indoors, out of direct sunlight

• Replacement: Same as WF-10B (visual checks make timing easier)

WF-20B — 20" Big Blue Housing (WITH WRENCH)

• Cartridge size: 4.5" × 20"

• Why it’s the sweet spot: Low pressure drop + long life for most homes

• Best for: 3–5 people, 2–3 baths; UV/softener/descaler pre-filtration

• Typical use: Single Sediment (5–10 μm) or single Carbon

• Typical replacement: Sediment 6–12 mo · Carbon 9–12 mo

WF-20BC — 20" Big Blue CLEAR (WITH WRENCH)

• Difference: Same capacity as WF-20B with transparent sump

• Replacement: Same as WF-20B

WF-20B2 — 20" Big Blue DOUBLE (WITH WRENCH)

• Why two stages: Staging boosts performance & cartridge life

• Recommended configs:

  • Sediment 20 μm → Sediment 5 μm (well water / heavy particulates)

  • Sediment 5–10 μm → Carbon (municipal chlorine/odor; UV/softener pre-filter)

• Typical replacement: Stage-1 Sediment 6–9 mo · Stage-2 Sediment 6–12 mo · Carbon 9–12 mo

WF-20B3 — 20" Big Blue TRIPLET (WITH WRENCH)

• Why three stages: Maximum protection, flow, and final polish

• Recommended configs:

  • Sediment 20 μm → Sediment 5 μm → Carbon (municipal or clear well water)

  • Sediment → Carbon → Specialty (KDF/metal reduction, scale inhibitor, lead-reducing carbon)

• Typical replacement: Coarse Sediment 6–9 mo · Fine Sediment 6–12 mo · Carbon/Specialty 9–12 mo

Where these housings fit in your system

• Before UV: lowers turbidity so UV can disinfect effectively

• Before softener/descaler: keeps valves/media clean, extends life

• Before carbon tanks / iron / tannin filters: catches grit that can foul primary units

• Before undersink RO: reduces load on the RO membrane

Still unsure which to pick?

• Set-and-forget for most homes: WF-20B

• Well water / staged protection: WF-20B2 or WF-20B3

• Visual maintenance: WF-10BC / WF-20BC

• Tight space / light use: WF-10 or WF-10B

Replacement intervals vary with water quality, usage, and cartridge brand. Replace sooner if taste/odor returns, flow drops, or ΔP rises 10–15 psi.