09/09/2026
Ever wonder what actually happens inside your reverse osmosis system?
Here are the four stages your water passes through before it reaches your water cup.
Stage 1: Sediment pre-filter. This removes dirt, sand, and larger particles before the water moves any further.
Stage 2: Carbon pre-filter. This stage targets chlorine, odors, and taste issues so they do not reach the membrane.
Stage 3: RO membrane. This is where the real work happens. Water is pushed through a semi-permeable membrane that filters out dissolved contaminants down to the microscopic level.
Stage 4: Post-filter and storage tank. One last carbon polish removes any remaining taste or odor, and the water sits ready in the tank until you turn on the tap.
Your filters do not last forever.
Over time, they lose their ability to catch what they are supposed to catch, and you will not always notice until your water quality changes.
Regular filter checks keep your system working the way it should.
If you cannot remember the last time yours was serviced, that is usually a sign it is time.
If it has been a while, let us check it for you. Call 763-535-1800 to schedule a free in-home water test.