The OmniFilter OB5-S-05 is a 5-micron carbon block filter designed to reduce chlorine taste and odor, sediment, rust, dirt, and other particulates from your household drinking water. Its 5-micron rating means it captures fine particles while maintaining a steady flow rate, making it ideal for point-of-use and whole-house applications where improved taste and clarity are needed.

The OmniFilter OB5-S-05 has a rated filtration life of approximately 3 months or 2,000 gallons, whichever comes first. Actual lifespan depends on your incoming water quality and daily usage volume. For households with heavy sediment or high chlorine levels, more frequent replacement may be required to maintain optimal flow rate and contaminant reduction performance.

The OB5-S-05 is engineered to fit OmniFilter standard 10-inch Series A, OB-Series, and OB5 housings, including models such as the OB1, OB3, and OT32. With its standard 9-3/4" x 2-7/8" dimensions, it also works as a replacement in many other standard 10-inch Big Blue-style housings from comparable manufacturers, provided the housing accepts a 2-7/8" diameter carbon block cartridge.

The OmniFilter OB5-S-05 is manufactured to meet NSF/ANSI Standard 42 criteria for the reduction of chlorine taste and odor and aesthetic impurities. The carbon block media is tested against these standards to ensure reliable performance. Always confirm current certification details on the packaging, as aesthetic-effects certification focuses on taste, odor, and particulate reduction rather than health-based contaminants.

To install, shut off the water supply and relieve pressure by opening a downstream faucet. Unscrew the OmniFilter housing sump, remove the old cartridge, and insert the new OB5-S-05 with the gasket seated properly. Hand-tighten the sump back into place, then slowly turn on the water. Flush the system by running cold water for 5–10 minutes to remove any loose carbon fines before regular use.