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iSpring F4 Replacement Filter Cartridges Pack Review

Following the F3 is the iSpring F4 set of replacement filters which is a slight upgrade with one more extra filter than the F3.

The set comes with 4 different filters consisting of the first three prefilters of the RO process and an additional post-filter for the fifth stage in the RO system.

A polypropylene sediment filter forms the first line of defense in the F4 prefilters and it removes all the fine solid particles as small as 5 microns which includes silt, dirt, and sand that may clog the other filters.

In the second stage, the F4 offers a granular activated carbon filter (GAC) which help trap and absorb chlorine, chloramines and other different kinds of organic chemicals.

It employs both mechanical filtration and physical adsorption to effectively capture chlorine and chemicals. It can also efficiently remove unpleasant odors and tastes. The filter includes a special carbon media too which helps prevent bacteria growth in the RO system.

The last prefilter is a 5-micron activated carbon block filter. It traps and absorbs the remaining chlorine, chloramines, organic chemicals, and unpleasant odor thereby further enhancing the taste of the water. It also clears any remaining fine particles in the water prior to entering the RO membrane.

The fourth filter in the iSpring F4 set is yet another activated carbon filter which is the post-filter for the fifth stage of the RO system. This filter provides the final polishing of the RO water before it’s delivered to the faucet.

It absorbs any residual chlorine that seeped through the other RO stages and as well helps remove the particles that might have accumulated inside the RO storage tank and ended up in the store water.

As for installing these F4 filters, you will have little to worry about as they are all standard filters that will work with most under sink RO systems that utilize standard 10” x 20.5” housings.

It comes with a manual you can refer to should have trouble setting them up. The lifespan of the first three prefilters is 6 months while the post-filter can last up to one year. 

Price & Rating

The iSpring F4 Replacement Filter Cartridges Pack Review is rated 4.3* out of 5* and reviewed by 67 verified purchase customers and it is listed at the price of 25.96$.

ProductiSpring F4 Replacement Filter Cartridges Pack Review
Rating4.3 out of 5 stars
Recommended price(Check the latest price at Amazon.com)

Product Specification

Dimensions10″ x 2. 5″
Weight:2.2 lbs
Filters1x sediment filters
1x granular activated carbon filters (GAC)
1x carbon block filters (CTO)
1x post-carbon filter
Service life 6 months
Compatible RO systems & Multi-stage under sink filters


Does the inline post carbon filter have 1/4″ quick connect fittings on both ends?

Yes, both ends support 1/4″ quick connect fittings but the connectors do not come with the set, you have to reuse your old ones or you have to buy the connector separately.

Does this set work with other RO systems than the ones from iSpring.

Yes, if the RO system uses the standard 10″ x 2.5″ housing and same size of fittings.

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iSpring F4 Replacement Filter Cartridges Pack

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