iSpring F4 for Standard Reverse Osmosis RO Systems with Post Carbon Replacement Supply Filter Cartridge Pack Set, 4 Count (Pack of 1), White, 4 Pieces
About this item
- Individually wrapped 6-month high capacity prefilter replacement cartridge pack for most standard RO systems
- 4 pieces of 10" x 2. 5" replacement water filters included: 1x sediment filters, 1x granular activated carbon filters, 1x carbon block filters, and 1x post-carbon filter
- Updated FT15 post-carbon filters are built with a secure push-fit quick connection, which allows faster filter replacement. If you have trouble installing the filters, please refer to the user manual or contact us
- This filter pack does NOT include an RO membrane
Frequently Bought Together

iSpring F4 for Standard Reverse Osmosis RO Systems with Post Carbon Replacement Supply Filter Cartridge Pack Set, 4 Count (Pack of 1), White, 4 Pieces


Sediment Filter
The Sediment Filter works as the first barrier in the Reverse Osmosis System, removing solid particles like silt, rust and dirt from the water and reducing a significant percentage of contaminants in the water. It prevents the other filters from getting clogged with fine particles and reduces the risk of damages to the other components.
iSpring’s first stage Sediment Filter (FP15) features a 5 micron size, perfect for capturing most of the fine sediments in the municipal water and preventing issues from clogs and pressure loss with filters that have smaller micron sizes.

Granular Activated Carbon Filter
Activated Carbon filters can trap and absorb organic chemicals and chlorine from the water effectively with its ability of mechanical filtration and physical adsorption. It can efficiently remove odors and improve the water taste.
Furthermore, the iSpring 2nd stage Granular Activated Carbon (GAC) filter (FG15) includes special carbon media that filters out impurity in the water, which can efficiently protect and prolong the lifespan of the reverse osmosis membrane.

Carbon Block Filter
Activated Carbon filters can trap and absorb organic chemicals and chlorine from the water effectively with its ability of mechanical filtration and physical adsorption. It can efficiently remove odors and improve the water taste.

Post Carbon Filter
Activated Carbon filters can trap and absorb organic chemicals and chlorine from the water effectively with its ability of mechanical filtration and physical adsorption. It can efficiently remove odors and improve the water taste.
iSpring 5th Stage Post Carbon filter (FT15) works as the final stage in the RO system to capture any particles that may have accumulated inside the tank before pure water is delivered to the faucet. It can last up to 12 months depending on your source water and usage.
- Sediment Filter
- Granular Activated Carbon Filter
- Carbon Block Filter
- Post Carbon Filter
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- 75 GPD RO Membrane
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Product Description
Size:6-month Supply (With Post Carbon)What is included:
- One 5 micron sediment filter: 5e micron rating, it removes dirt, rust and sand particle.
- One granular activated carbon (GAC) filter: adsorb chlorine, halide, other contaminants, odors, and other impurities that contribute to bad taste and odor.
- One 5 micron carbon block filter: removes any remaining chlorine and other chemicals. Further, it enhances the taste of water.
- One post carbon inline filter: this carbon post filter removes objectionable tastes and odors to enhance the quality of your drinking water.
- Compatible to most ro systems, includes watts premier, Flowmatic, puroline, crystal quest, apec, and etc. All tested by independent third-party to meet NSF/ANSI Standard.
Why ispring?
Located in Alpharetta, Georgia for over a decade, iSpring water systems LLC is a family owned company specializing in reverse osmosis water filtration systems. Our products include residential and commercial reverse osmosis (ro) systems, whole house water systems, Ultrafiltration systems, shower, faucet, and counter top filters, filter cartridges and housings, ro coolers, and kitchen faucets and fittings. Our aim is to make drinking water accessible to all households. With affordable pricing, solid quality, Prompt delivery, and customer service, we hope to assist in bringing you great water for years to come.
- Availability: In Stock
- Model: F4
- Manufacturer: iSpring
Reviews with images

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2018-06-14
iSpring has great products and systems. I have the 5 stage iSpring RO system on hard well water. My setup has 20" filters all the way down to 0.5 micron and a softener before distributing to the house and this system takes the TDS after all my other filters from ~410 to ~23. The 6 month filter replacement is an exact fit and I prefer the taste over bottled water. If you go to contact the manufacturer for anything Nick from iSpring is great!


2020-04-19
I am a regular customer of this filters. I always purchase this to replace for my ro unit.

2019-11-17
I haven't noticed any difference in water quality between these and the more expansive name brands. Great filters.

2019-10-16
Installed it around thanksgiving and just had my filters replaced. These filters are very affordable and installed without any issues.

2018-09-09
Very happy with the quality. The water tastes great and no longer smells of chlorine.

2018-06-15
If you want good clean water, yes I recommend them. Filters have to be changed every six months but we'll worth the cost.