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ICS-SIK Replacement Filter for ICS-SI System


Treatment Included

S, Sediment I, Iron K, Replacement Kit


Whole House

Filter Size

4.5" x 20"

ICS-SIK - Replacement Filters - Cascadian Water

Product Details

ICS-SIK cartridge filter replacement kit

The ICS-SIK Sediment and Iron cartridge filter replacement kit is designed specifically for the Cascadian ICS-SI and engineered to filter sediment, iron and manganese from all the water for every use in your whole home or business. 

Not for Hydrogen Sulfide (rotten egg) odor. If you are looking to reduce sulfur H2S hydrogen sulfide odor please see our ICS-H. 

Contains two cartridge filters

  • First treatment is a multimicron depth sediment filter to protect and clarify
  • Second treatment is a iron and manganese filter to stop orange/red and brown/black stains

Rely on our expertise to deliver the simplest water treatment

  • Eco-Friendly

    No water waste

  • Legal Everywhere

    Our filters can be used where salt softeners are banned

  • Easy Maintenance

    Change filters once or more per year

  • 60 Day Guarantee

    Return it, not questions asked

  • Filter Subscriptions

    Purchase your first replacement filters after a year with your system and select the subscription option to save time and 10% off.

    Filter Subscription
  • Product Specification

    Each product has specific capabilities and unfortunately can't treat every type of water. Find details on the specification.



Where does ICS go in my Home?

Where it can fit, and where it can easily get access to your home's water source. This is typically a garage, crawlspace, or even a closet. If you have questions a plumber would be able to help you find the best spot. During maintenance you'll need to fit a bucket and have enough space to turn the sump wrench which comes with your system.

How often do I replace the filters?

Most people replace their filters once per year, or sooner if they start seeing issues with their water again. Learn about water issues here

What is the return policy?

If you are unsatisfied within 60 days of purchase, return the housing and we'll refund your purchase no questions asked.

How fast do you ship?

We typically ship same business day if the order is placed before 2 pm PST using UPS ground.

Does this include housing o-rings?

No, the replacement kits do not come with o-rings.

Customer Reviews

Based on 2 reviews
John VanDamme (Coupeville, US)
Perfectly Pure

The best part is not having to worry about having to make changes for a whole year. We have pure water the entire time. The system is flawless..

Hi John, thank you for sharing your thoughts and experience highlighting one of the most often overlooked benefits, low maintenance. Enjoy your flawless system!

Carolyn Elliott (Los Angeles, US)
I rely on my filters.

Every nine months I replace my filters to remove the iron out of my well water. What a difference it makes. Thank you, CASCADIAN for your quality products.

Thank you Carolyn for sharing your personal experience with your ICS-SIK. Sharing your experience will help others who are considering a Cascadian water treatment system of their own.