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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Express Water FLTWH2045CKS1 Whole House Heavy Metal Replacment Filter Set

Express Water FLTWH2045CKS1 Whole House Heavy Metal Replacment 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

⚙️Easy cartridge replacement

🛡️3-stage heavy metal removal

R9592

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Description

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

WHOLE HOME PURITY - Advanced 3-stage filtration protects every tap in your house.
APPLIANCE LIFESAVER - Extends lifespan of your dishwasher, laundry, and more by reducing damaging sediments.
HEAVY METAL DEFENSE - KDF filter neutralizes lead, iron, nickel & chromium for safer water.
EFFORTLESS MAINTENANCE - Quick-swap cartridges keep your system running smoothly without downtime.
LONG LASTING PERFORMANCE - Filters up to 100,000 gallons—less hassle, more peace of mind.

The Express Water FLTWH2045CKS1 is a premium whole house heavy metal water filter set featuring a 3-stage filtration system with KDF heavy metal removal, activated carbon, and sediment filters. Designed for up to 100,000 gallons of filtration, it ensures safer, cleaner water throughout your home while protecting appliances and pets. Easy cartridge replacement and certified quality make it a top choice for millennial professionals seeking health-conscious, efficient home solutions.

Specifications

ASIN	B01LVZ5RZO
Best Sellers Rank	#5,004 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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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R9592

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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