Sure, here's a refined and simplified version of the original title, focusing on the product keywords in English: iSpring FG25B-KS GAC and KDF Whole House Water Filter Cartridge, 4.5” x 20”

The FG25B-KS 20” x 4.5” compound filter is the official 2nd stage replacement filter cartridge for iSpring WGB32B-KS Whole House Water Filtration System and also fits standard 20" whole house water filters. Made of quality GAC and KDF, this filter is designed to remove chlorine, lead, mercury, hydrogen sulfide, heavy metals, pesticides, herbicides, odors, and other contaminants. Working in tandem with carbon filters (FC25B) and sediment filters (FP25B), the FG25B-KS creates a reliable shield that protects you and your family from harmful chemicals and contaminants, no matter which part of your home you are getting your water from.

The filter set fits standard whole house water filter housings that require 20” x 4.5” cartridges, and each cartridge is individually wrapped to ensure freshness. It is recommended to unwrap the cartridges before installation.

Based on the contamination level of your source water, the filter changing schedule should be every 10-12 months or after filtering up to 150K gallons of water. The filter cartridges are hassle-free and replacement is simple.

For peace of mind, technical assistance and customer service support are offered by phone or email from the headquarters in Atlanta, GA. The knowledgeable team is available to help find a filtration solution that best matches specific water concerns or provide any after-sale support needed to maximize user experience.

It is important to note that unlike an RO membrane, this filter does not reduce Total Dissolved Solids (TDS). Instead, it keeps healthy minerals in the water while removing harmful chemicals. For TDS removal, consider the iSpring Reverse Osmosis (RO) systems.

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