Micron is the question every whole-house filter owner asks, and the honest answer is: it depends on the size of what is in your water. A micron rating tells you the particle size a cartridge is designed to capture — lower number, finer filtration. Choosing is a balance. Too coarse and sediment passes through to your faucets. Too fine and the cartridge loads quickly, pressure drops, and you are changing filters every few weeks.
The micron ladder, from coarse to fine
50–100 micron — coarse protection. For visible sand, grit and heavy well-water sediment. This is a first-stage rating: it catches the big material that would instantly clog a finer cartridge, and it is the right starting point if your well pumps sand or your current filter turns brown in days.
20–30 micron — general whole-house sediment. The workhorse range for average dirt and sediment loads, on well or city water, when you want solid protection without babying the system.
5–10 micron — finer dirt and rust. Five micron is the most popular sediment rating in whole-house filtration and the default in most replacement searches, including the classic 20 x 4.5 sediment filter 5 micron. Choose this range when your water is moderately clean and you want finer polish.
1 micron — final stage only. The finest rating we make. On its own, against raw well water, a 1 micron cartridge can clog in days and noticeably drop pressure. Used after a coarser stage, it is an excellent polishing step. If you are asking "it's 1 micron, should I increase to 5?" because of clogging — yes, that is usually the right move, or add a coarse stage in front of it.
Stepped filtration: how the pros set it up
Guides and experienced well owners use the same pattern: step down gradually. A sandy well might run 50 micron, then 20 micron, then 5 micron, so each cartridge catches its share and lasts months instead of days. A clean city-water home may need only a single 5 or 20 micron cartridge. Match the ladder to your load, not to a sales pitch.
Signs your micron is wrong
Clogging in under a month, pressure falling soon after a change, or a cartridge that looks barely used while sediment still reaches your taps all point to a rating mismatch. Change one step at a time so you can see the effect. When you are ready, shop 5 Micron Sediment Filters, the stepped options in Well Water Sediment Filters, or the full range in Whole House Sediment Filters. Every Hydrana cartridge is manufactured in the USA and made to order in your size and micron — and if you are replacing an existing cartridge, matching its printed rating is always a safe start. See also the Filter Guide: Find Your Fit.