Pentair Pentek WS-10 Water Softener Cartridge, 10" x 2.5", 750-Grain Cation Resin for Scale Reduction in Coffee, Espresso and Beverage Equipment
Condition: New
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Extended holiday returns
FREE refund/replacement until Jan 31, 2027 Learn more
FREE refund/replacement until Jan 31, 2027 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Sunday, Nov 15
At a glance
- Condition
- New
- Style
- 10 in x 2.5 in
- Model
- WS-10
- Weight
- 1 lb
- Material
- Cation Resin
- Product Benefits
- Removes Impurities
- Item Type Name
- Water Softener 10”Cartridge, 155319-43
Features 5
- HELPS PROTECT EQUIPMENT FROM HARD WATER SCALE - Sodium-form cation resin reduces hardness and minerals to safeguard espresso machines, medical devices, and beverage systems
- 750-GRAIN SOFTENING CAPACITY - Rated at 750 grains as CaCO3 at a recommended flow rate of 0.50 gpm, delivering reliable ion exchange performance per cartridge
- INTERNAL EXPANSION PAD PREVENTS CHANNELING - Keeps resin evenly distributed during operation so water contacts the full media bed for consistent softening
- POST-FILTER ELIMINATES RESIN BYPASS - Polypropylene post-filter captures fine resin particles, ensuring only softened water reaches your downstream equipment
- UNIVERSAL 10 INCH X 2.5 INCH FIT - Drop-in replacement for any standard or Slim Line 10 inch housing with Buna-N gaskets for a secure, leak-free seal
Description
The Pentair Pentek WS-10 water softener cartridge uses high-capacity cation resin in sodium form (20 x 40 mesh) to reduce calcium, magnesium, and other hardness minerals through ion exchange. With a 750-grain capacity rated as CaCO3, it delivers dependable softening at a recommended flow rate of 0.50 gpm within an operating temperature range of 40 to 100 degrees Fahrenheit.Engineered for consistent performance, the WS-10 features an internal expansion pad that minimizes resin channeling and a polypropylene post-filter that captures fine particles to eliminate bypass. Polypropylene endcaps and pre-filter media provide durable construction, while Buna-N gaskets ensure a reliable seal inside the housing.Designed for point-of-use applications including commercial coffee and espresso machines, beverage dispensing systems, medical equipment, and food service operations. The single-use cartridge fits any standard or Slim Line 10 inch by 2.5 inch housing, making replacement straightforward with no regeneration required.
Specs 18
| Material | Cation Resin |
|---|---|
| Product Dimensions | 2.5"D x 2.5"W x 10"H |
| Item Weight | 1 pounds |
| External Testing Certification | NSF |
| Product Benefits | Removes Impurities |
| Model Number | WS-10 |
| Brand Name | Pentek |
| Number of Packs | 1 |
| UPC | 051678319031 807034599025 |
| Global Trade Identification Number | 31 |
| Unit Count | 1 Count |
| Number of Items | 1 |
| Item Type Name | Water Softener 10”Cartridge, 155319-43 |
| Manufacturer | Pentek |
| Manufacturer Part Number | 155319-43 |
| Item Dimensions D x W x H | 2.5"D x 2.5"W x 10"H |
| EU Spare Part Availability Duration | 2 years |
| Material Type | Cation Resin |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Nov 15
Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
They really work
Style: 20 Inch x 4.5 Inch
I was skeptical about this filter. I feared that (1) it wouldn't filter well, or it would have a reduced flow rate compared to the activated carbon filter that we were using. And (2) I feared that the "water softening" claim would be a gimmick of some sort. However, I am very pleased that this filter performs as claimed. The flow rate is slightly higher than the pleated/carbon filters that we replaced. The filtering is fine, with no noticeable increase in solids. And the filtered water is actually soft. We can lather in the shower; the dishwasher actually works now; the clothes washing machine produces better results. I will buy these again -- this is now our preferred filter. We live in northeast Wyoming right next to a creek. Our well is only 20 feet deep, and we are basically drinking creek-water. So, we depend on the big blue filter and a UV-lamp system to make our water potable. With activated carbon filters and the UV system, we were safe. But the water was very hard. We don't have room for a traditional water softening system without major remodeling. So, this filter provides a convenient upgrade. Yes, the filters are expensive, but in my opinion, they are a good value.
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Reviewed in the United States on June 5, 2016 by Dr. Cap Smith
This does work well! If you want to 'recharge' the resin with salt water, there is one trick you have to do first.
Style: 10 Inch x 2.5 Inch
This absolutely softens our hard FL water quite well... although keep in mind the low (750 grain) capacity. Get a water analysis kit to see how useful it will be for you... for instance, the water quality kit showed our water have approximately 20 grains per gallon. 750/20 = 37.5 gallons of softened water before the resin is depleted. However, you can recharge it with salt water, greatly extending its usefulness. Do NOT just dump the cartridge in salt water like I did at first... it will not recharge (or will do so very very slowly). You need to purge the water that's already inside the filter first, then ideally fill that filter with salt water afterwards. I used a water bottle, filled it with salt water, and squeezed it gently through the top of the filter.. you really have to get it so it seals at the top of the filter. it purged out the fresh water and replaced it with salt water, allowing the resin to recharge. Works good as new after a day or so.
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Reviewed in the United States on October 11, 2017 by DK3
Does what I need
Style: 10 Inch x 2.5 Inch
It works fine, price has been climbing and it's only an average value now, used to be a better value.
Reviewed in the United States on March 7, 2023 by DNolan
I'll buy it again.
Style: 10 Inch x 2.5 Inch
Excellent products for people who lives in areas where the water is hard, like New Jersey and Florida. Don't forget, it is just an addition to your current water filtration system.
Reviewed in the United States on June 19, 2025 by Frank Paulino
Doesn't work
Style: 10 Inch x 2.5 Inch
I have successfully used this specific product before and it worked great. However, this time the first one I ordered did not work so I ordered another one under the assumption that I just got a bad one. Same thing again. I then ordered a different vendor's softener cartridge and it worked fine. It is possible that the seller got a bad batch and that the two I ordered a few days apart came from the same bad batch. However, keep this in mind should you decide to order one.
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Reviewed in the United States on March 1, 2020 by Charles Rimpo
Fixed my hard water problem
Style: 10 Inch x 2.5 Inch
My water was so bad I had to clean out my water heater tank every 3 months. I tried this cartridge and it's been 9 months and There's barely any residue on the heating element.
Reviewed in the United States on November 9, 2024 by Bruce L.
Works like the expensive Cascadian filter
Style: 20 Inch x 4.5 Inch
Installed just like the hugely expensive filters. Same great taste. I can do these myself. Plumber said he needed to install the filters at a cost of $700.00. Guess what these work, taste great and I can save $600.00. Yea whoo
Reviewed in the United States on May 30, 2024 by Amazon Customer
Open this immediately - my second filter totally smashed - Filter does an OK job
Style: 20 Inch x 4.5 Inch
I have used these filters to reduce the hardness in our water in our condo (which cannot support the traditional Water softener that requires salt to be replaced and a large space. You have to change these filters frequently as their life span is limited. I re-ordered two of the Pentek WS--20BB (I always try and have one in reserve as I measure the hardness of the water and sometimes I have to replace the filter in advance of the manufacturers recommended number of gallons it will process). I opened the first box upon receipt and installed it in my Big Blue. The filter you will find is not perfect but it does an adequate job in a condo environment (better than nothing) and it cut the hardness of our water in half (clothes are cleaner, dishes do not cloud, etc.). I just arrived at the recommended replacement point (more than 30 days later), based on water flow rate and the second WS-20BB filter was smashed and damaged - see pictures. My recommendation - first, open these filters immediately upon receipt and thoroughly check for damage. Second, DO NOT ORDER TWO or MORE at a time. Amazon needs to pack these filters with some padding when sending more than one filter (BTW - there is no padding in the packing the box the filter is delivered) as the filters are very heavy, which probably attributed to the damage to the top of the second filter which was leaking "brown" sand type material used in the water softener process.
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Reviewed in the United States on September 14, 2021 by BAR9701