Hydronix sediment cartridges cover the second filtration stage in undersink UV setups, sitting ahead of the UV lamp to catch dirt and particulate before disinfection. Options include Polyspun (SDC series) depth cartridges, string-wound cartridges, and a 12-inch inline cartridge rated to 5 microns. Multiple sizes and micron ratings are available on the polyspun and string-wound options, so check your housing dimensions before ordering.
Additional Information
FAQs
What does a 2nd-stage pre-filter do in a UV system?
In a multi-stage undersink UV setup, the second stage removes dirt, rust and sediment from the water before it reaches later stages such as carbon filtration or the UV lamp itself, protecting downstream components and keeping the water clear.
What's the difference between polyspun, string wound and inline cartridges?
Polyspun (depth) cartridges use layered spun fibre to trap particles throughout their thickness. String wound cartridges use tightly wound cotton or polypropylene string for a similar depth-filtration effect. Inline cartridges are a sealed unit that connects directly into the pipework rather than sitting in a separate housing. Each suits a slightly different setup.
How do I know which micron rating I need?
Micron rating determines the smallest particle size the cartridge will catch. A lower number, like 1 or 5, filters finer sediment but may need more frequent replacement, while a higher number, like 20 or 50, catches larger debris and lasts longer between changes. Matching the rating to how much sediment your water supply typically carries is the key decision.
How often should this cartridge be replaced?
Replacement frequency depends on water quality and usage, but a visible drop in flow rate or a cartridge that looks visibly clogged are the clearest signs it's due for a change.
Can I use any of these cartridges in a standard housing?
Sizing needs to match your specific housing in both length and diameter, so check your system's cartridge dimensions rather than assuming a universal fit across all three types.
Why is sediment filtration important before UV treatment?
Sediment and cloudy water can shield microorganisms from UV light or coat the UV lamp's sleeve, reducing how effectively it disinfects. Filtering sediment out beforehand keeps the UV stage working at full strength.