5 Micron 4.5″ x 20″ CTO20BB-CQB Water Filter for Whole House
Price range: $71.99 through $143.99
Frequently bought together
5 Micron 4.5″ x 20″ CTO20BB-KDF Whole Home Water Filter Heavy Metal Removal – 1 Pack
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Overview
Lead-focused carbon filtration. An enhanced carbon block for lead, chlorine, taste and odor concerns in municipal water.
Check your 20″ × 4.5″ housing. Confirm the housing model, cartridge end caps and seals before ordering.
Choose a 1- or 2-pack. Select your pack above. For a private well with heavy sand or sediment, compare suitable pre-filtration before choosing a carbon stage.
Specifications
| Model | CTO20BB-CQB |
|---|---|
| Cartridge dimensions | 20 inches length × 4.5 inches diameter |
| Filtration rating | 5 micron |
| Media | Enhanced carbon block |
| Available packs | 1 Pack / 2 Pack |
| Listed capacity | Up to 100,000 gallons, depending on local water quality |
| Replacement guidance | Every 6–12 months per this model’s description |
Check the housing model, cartridge end caps and seals. Dimensions alone do not establish compatibility. Water conditions and required flow also affect your choice.
Help me choose — optional buying guide
Already know your filter? Choose your pack in the purchase area. Use this guide only if you need help comparing an option for your existing system.
Municipal water: chlorine, taste or odor
Compare Carbon Block and CTO20BB-KDF for a compatible 20″ × 4.5″ housing. Choose the exact model and its pack on that product page.
Well water or visible sand, rust and sediment
Check your water report and sediment loading first. Compare the existing 20″ × 4.5″ PP sediment cartridge. Heavy sand or mud may require pre-filtration before this KDF/carbon model.
A specific lead, iron or manganese concern
Use a water report to identify the measured concern and compare the exact model’s water-condition and flow limits. Compare CTO20BB-CQB and its named claims or view the iron/manganese model. Cartridge dimensions do not establish its performance for your water.
Hard water or scale
Hardness needs a separate treatment plan. A standard sediment or carbon cartridge does not soften water.
My city-water system already has two separate 20″ × 4.5″ housings
This example is for two existing, independent housings. Confirm each housing’s end caps and seals, your water report, and the required flow before ordering.
- First housing: sediment. Existing 20″ × 4.5″ PP sediment cartridge — catch visible sediment before the next stage.
- Second housing: KDF + carbon. Existing CTO20BB-KDF cartridge — address a chlorine, taste or odor goal after sediment.
One housing cannot hold this two-cartridge layout. This is a layout to compare, not a guaranteed compatible bundle. Choose each existing product’s pack separately. For a private well, confirm chlorination and source-water conditions before choosing a carbon stage.
If your installed cartridge is a different size, use its full model number and housing manual to find the corresponding size. Do not buy this 20″ × 4.5″ cartridge for a 10″ × 2.5″, 10″ × 4.5″ or 20″ × 2.5″ housing.
FAQs
Can I choose by dimensions alone?
No. Check your housing model, cartridge end caps, seals and required flow along with the dimensions.
Does choosing a different filtration option change the pack?
The filtration links open existing product pages. Choose the available pack on the product page you select.
When should I replace this cartridge?
This model’s description recommends replacement every 6–12 months. Water quality and use affect the actual replacement timing.
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