Skip to content
Shop Your Local Store Ship to Your Hometown Store
Pro & Contractor Accounts Apply for Net Terms
100,000+ Products Trusted Authentic Brands

Pentair OMNIfilter Replacement Cartridge

Rated for 3,000 gallons, this cartridge tackles lead, chlorine taste, sediment, and more in one whole-house filter swap.
Pentair MPN 4005730 In Stock & Ready to Ship
$109.99
Free shipping on orders over $75
Ships within 24 hours · most orders arrive in about 2 business days

About Product Overview

This Pentair OMNIfilter cartridge is the replacement element for whole-house water filtration systems, rated for 3,000 gallons before it needs swapping out again. It's built to handle a wide range of contaminants in one pass, which makes it a solid choice for households on well water or municipal supplies with taste and odor issues.

Beyond the basics of sediment and chlorine taste and odor, this cartridge is rated to reduce lead, cysts, pharmaceuticals, and other chemicals that can show up in tap water, along with microorganisms. That's a broad performance range for a single cartridge, and it's why OMNIfilter systems are a common pick for anyone wanting cleaner water at every tap in the house without adding a separate under-sink unit. Measuring 4.75 x 4.75 x 15.5 inches and weighing 2.6 lbs, it fits standard OMNIfilter whole-house housings. Sold one per package.

  • Brand: Pentair, Sub-Brand: OMNIfilter
  • Capacity: 3,000 gallons
  • Reduces chemicals, chlorine taste and odor, and sediment
  • Reduces lead, cysts, and pharmaceuticals
  • Reduces microorganisms
  • Dimensions: 4.75" x 4.75" x 15.5", Weight: 2.6 lbs

The Details Specifications

Brand Pentair
Model / MPN 4005730
UPC 051678024096
Weight 3 lbs
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to price-check us against Amazon, Home Depot, and Lowe's. Everybody does. Good — open all three tabs. We'll wait. Then look hard at what you're actually being handed over there.

On Amazon, start with these four questions before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Pentair. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

The big boxes don't care if your hardware store survives.

Amazon, Home Depot, and Lowe's are built to pull every hardware dollar out of your town. When the local shop can't keep the lights on, the counter where somebody actually knew which part you needed goes with it. We're built the other way: real brands so you're never stuck on a marketplace, and a straight answer to buy it down the street when that's the better call. Support independent hardware — it doesn't restock itself.

Why we tell you to shop local
Authorized dealer · Pentair

Or skip the tabs entirely and buy it down the street. Find a store near you →

Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare