- Nitrate/nitrite reduction filter
- Aries brand - made in the USA
- Standard 4.5-inch x 20-inch filters
- Aries AF-20-3610-BB
Standard Big Blue filter fits standard 4.5-inch x 20-inch housings. Nitrate filter reduces nitrates and nitrites in the water, a common contaminant and cause of Methemoglobinemia, or "Blue Baby Syndrom". Manufactured in the USA by Aries Filterworks and NSF certified.