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ICS-STP PolyHalt® Water Softener with Taste/Sediment Filters

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Routine Maintenance Kit


ICS-STP Water Treatment System

The ICS-STP is a cartridge-filter based water treatment system engineered to produce high-quality water for every use in home or business. It is three high-performance treatments in one small wall-mounted system. The ICS-STP combines our ICS-SP and ICS-TP treatment systems and is one of our top sellers. It is an excellent choice for city or well water.

Contains Two Filters:

Filter One:

The first filter is a high capacity multimicron sediment filter. This filter removes particles down to 5 micron to clarify the water and protect downstream treatment and the plumbing, fixtures and appliances.

Filter Two:

The second filter is a top quality activated carbon filter combined with Cascadian PolyHalt®. It is specially designed to reduce the total number of filters required for maximum treatment without increasing the overall size of the treatment system.

Water is first treated by passing through the activated carbon component to reduce chlorine, improve taste and odor, and reduce volatile organic compounds (VOC's).

After carbon treatment the water passes through PolyHalt® media where it is further conditioned to treat silica and blue copper staining which extends the life of plumbing, fixtures, appliances, windows and glassware etc., by protecting them from damage caused by untreated water.

Be sure the ICS-STP treatment system is right for you - take the Filter Finder Quiz.

    See product specifications below for more details

    Details for Replacement Filter ICS-STPK 

      Other Specs

      Filter Size: 4.5" x 20"

      Connection: 1" FNPT

      Treatment Included: S, Sediment T, Taste & Odor P, PolyHalt

      Spec Sheet: SPEC metafield

      Product Manual: MANUALPDF metafield

      • 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, no questions asked

      Frequently Asked Questions

      Where does the ICS system 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.

      Rely on our expertise to deliver the simplest water treatment