Do new "o-rings" come with the filter kit? If not, what is the part number for the "o-rings" and where do you order them?

The O rings do not come with the replacement filters, you need to buy them from Water Express.

So the pentek, ispring, express, igeek and ect. filters will "all", work as long as the housing is 4.5 x 20"? but filter quality is diff?

Well dont know all those but If the housing is the same it should. I had ispring setup and just upgraded the filters to heavy metal filter set and they are great! No issues. Hope that helps

how to open the blue housing ? no matter what I tried I can not open the blue houseing to replace the filter

You first have to shut the water off to the system...Next you have to release the pressure in the system, there should be a red button on top of the system press that button and watch the pressure drop on the gauge..Note there will be some water so have a towel ready ..Next use the wrench that came with the system when you bought it ... It looks like a small tennis racket with no strings...slide that up the blue tube and spin it off....Note that the first time I had to change the filter the blue tube was on very tight ,so take your time and be careful....Hope I was able to help....

Will these cartridges fit the ISpring big blue system that uses the 4.5" x 20" filter cartridge?

Yes they will. Cartridge should say in details what size they are. I have used them in mine. Personally tho I feel the original name brand ones are better quality.

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Heavy Metal Filter Set

Product ID: 44881487

Details

Brand
EXPRESS WATER
External Testing Certification
ANSI WQA NSF
Material
Polypropylene
Product Benefits
Removes and
Product Dimensions
4.5"D x 4.5"W

💧100,000 gallons filtration capacity

⚙️Quick & easy cartridge replacement

🛡️3-stage heavy metal & sediment defense

€ 419.60

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Description

💧 Elevate your home’s water game — because clean water is the new luxury.

APPLIANCE LIFESAVER - Protects your dishwasher, laundry machine, and more by reducing damaging impurities, saving you costly repairs.
EFFORTLESS MAINTENANCE - Designed for quick, tool-free cartridge swaps so your water stays fresh without downtime or hassle.
SMART SEDIMENT DEFENSE - 4-layer sediment filter traps large and fine particles, extending filter life and safeguarding your plumbing.
WHOLE HOME PURITY ZERO COMPROMISE - Advanced 3-stage filtration removes heavy metals, sediment, and chlorine for crystal-clear water throughout your home.
ENDURANCE THAT OUTLASTS EXPECTATIONS - Filters up to 100,000 gallons, delivering long-lasting protection without frequent replacements or pressure loss.

The Express Water FLTWH2045CKS1 is a premium whole house heavy metal replacement filter set featuring a 3-stage filtration system with KDF heavy metal filter, activated carbon block, and 4-layer sediment filter. Certified by ANSI, WQA, NSF, and RoHS, it delivers up to 100,000 gallons of high-capacity filtration, effectively reducing heavy metals like lead, iron, and chromium while protecting your entire home’s water supply and appliances. Easy to install and replace, it ensures long-lasting, efficient water purification without pressure loss.

Specifications

ASIN	B01LVZ5RZO
Best Sellers Rank	#5,021 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Whole House Water Treatment Systems
Brand Name	EXPRESS WATER
Compatible Water Purifier Models	Express Water FLTWH2045CKS1
Customer Reviews	4.6 4.6 out of 5 stars (897)
External Testing Certification	ANSI, WQA, NSF, Ro
Global Trade Identification Number	00641990965636
Included Components	KDF Filter, Activated Carbon Block Filter, Sediment Filter
Item Dimensions D x W x H	4.5"D x 4.5"W x 20"H
Item Type Name	Whole House Heavy Metal Water Filter Set
Manufacturer	Express Water
Manufacturer Part Number	FLTWH2045CKS1
Material Type	Polypropylene (PP)
Model Number	FLTWH2045CKS1
Number of Items	1
Product Benefits	Removes harmful impurities and heavy metals, saves time and money, extends appliance life
Set Name	Whole House Heavy Metal Water Filter Set
UPC	641990965636
Unit Count	1 Count

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€ 419.60

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to GERMANY.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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