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Harmsco

Harmsco (HB-20-0.35W) 20"X4.5" Big Blue "Calypso Blue" Pleated Sediment 0.35 Micron Filter

Product Code HB-20-0.35-W

$124.09

Harmsco Big Blue Sediment Filter

HB-20-0.35W Calypso Blue Pleated Polyester Cartridge

20" x 4.5" pleated sediment filter with 0.35 micron rating for whole-house and light industrial applications. Built to last, designed to be cleaned and reused.

0.35 Micron Reusable Up to 30 GPM
WHY IT WORKS

Premium filtration with long-term economy

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Sub-Micron Sediment Removal

0.35 micron pleated polyester media captures fine silt, sand, rust, and particulate that pass through standard sediment filters

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Cleanable & Reusable

Unlike disposable cartridges, the Calypso Blue can be backwashed or rinsed clean in most applications, reducing long-term replacement costs

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High Dirt Holding Capacity

Pleated construction offers more surface area than wound or spun cartridges, extending time between cleanings even in heavy sediment loads

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Wide Temperature Range

Plastisol PVC end caps and polyester media handle temperatures up to 140°F, suitable for well water, pool, spa, and light industrial use

SPECIFICATIONS

Harmsco HB-20-0.35W Technical Details

Model Number HB-20-0.35W
Dimensions 20" L x 4.5" OD x 1.06" ID
Micron Rating 0.35 micron
Media Type Polyester-Plus pleated
End Cap Material Plastisol (pliable PVC)
Flow Rate Up to 30 GPM (housing dependent)
Max Temperature 140°F (60°C)
Applications Potable water, well water, pool/spa, light industrial
COMPATIBILITY

Fits Standard 20" Big Blue Housings

The Harmsco HB-20-0.35W fits any standard 20-inch Big Blue filter housing with 4.5" diameter capacity and 1-inch center tube. Compatible with whole-house systems, well water pre-filtration setups, and dedicated sediment housings from Harmsco, Pentek, Hydronix, and other manufacturers using the 20" x 4.5" standard.

MAINTENANCE

Cleaning & Replacement Schedule

Every 1-3 Months

Inspect & Clean

Check differential pressure. Backwash or rinse cartridge when flow rate drops or pressure increases 8-10 PSI above baseline

After 3-5 Cleanings

Evaluate Condition

Inspect pleats for damage or permanent staining. Replace if cleaning no longer restores flow or if media shows tears or degradation

12-18 Months

Replace Cartridge

Even with regular cleaning, replace the HB-20-0.35W annually or when cleaning cycles shorten significantly

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Harmsco Quality

Manufactured by Harmsco, a trusted name in commercial and residential filtration since 1946

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Lower Operating Costs

Reusable design reduces filter replacement frequency and waste compared to disposable cartridges

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Easy Installation

Drop-in replacement for standard 20" Big Blue cartridges with no modifications required



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