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Fits any standard 10″ × 4.5″ Big Blue housing—no hacks required. High porosity prevents early clogging, maximizing carbon life while maintaining a low pressure drop.
Demand more than “just sediment.” Upgrade to Ultra‑D and guarantee sub‑micron protection, superior taste, and plumbing peace of mind.
The Ultra D Submicron Depth Filter with carbon and silver is a 20" x 4.5" replacement cartridge designed to fit standard 20" x 4.5" Big Blue housings. It removes over 99.99% of viruses, bacteria, and cysts, while significantly reducing heavy metals including lead, iron, arsenic, cadmium, chromium, selenium, and mercury.
Its activated carbon component helps remove chlorine, bromine, and iodine to improve taste and odor. The high porosity design helps maximize carbon life and supports low pressure drop. This filter is made in the USA and is described as suitable for whole house water filtration systems.
| Height | 20" |
|---|---|
| Diameter | 4.5" |
| Size | 20" x 4.5" |
| Source | https://unitedfilters.com/ |
| Manufacturer | Aqua Science |
| Shipping Weight | 6 |
This Ultra D replacement cartridge is designed for installation in a standard 20" x 4.5" Big Blue housing.

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