Water Filtration · Nashville, TN
On Tap
Water test results explained, systems that fit and systems that were oversold, and how to keep a softener, filter or RO unit doing its job.
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Water treatment, one test at a time
Written by Michael Blair, owner of Nashville's Water Filtration, from the trade’s own practice.
October 12, 2026
Where a Water Softener Drains, and the Air Gap
The tanks are the easy part of a softener install. The decisions that matter are where the regeneration water goes and how it gets there.
Read itOctober 8, 2026
Replacing a Water Softener or Repairing It
Hard water coming back does not always mean a new softener. It means a test, a look at the resin and the valve, and only then a decision.
Read itSeptember 28, 2026
Softener Salt Types and the Brine Tank Bridge
A softener that suddenly lets spots back onto the glasses often has plenty of salt. The salt just is not touching the water anymore.
Read itSeptember 21, 2026
Refrigerator Water Filters and What They Miss
Most people drink more water from the fridge than any other tap and assume the filter behind it is doing something. It is doing a little, and it stops doing that quietly.
Read itSeptember 14, 2026
Should You Test Your Water, and For What
Most water treatment is bought without a test. The right test, and it is not the same one for a city tap and a well, is what stops you buying the wrong equipment.
Read itSeptember 7, 2026
When to Change a Water Filter Cartridge
A filter past its capacity is not neutral. It can release what it captured, and it can host exactly what you installed it to remove.
Read itSeptember 1, 2026
What Is Actually in Nashville Water
Nashville tap water is safe and it is not neutral. Knowing what is in it tells you which filter is worth buying.
Read itSeptember 1, 2026
Is a Water Softener Worth It Here
The strongest argument for a softener here is not the shower glass — it is what hard water does to a water heater.
Read itSeptember 1, 2026
Whole-House Filtration or Under the Sink
Most households want better drinking water and end up being sold treatment for the whole house.
Read itSeptember 1, 2026
What Reverse Osmosis Does and Does Not
Reverse osmosis is the most thorough household treatment available, and thoroughness is also its drawback.
Read itSeptember 1, 2026
Treating Well Water in Middle Tennessee
A private well is your own utility, and nobody else is testing it.
Read itSeptember 1, 2026
Common Mistakes Buying Water Treatment
The most expensive mistake is buying a system before finding out what is in your water.
Read itService area
Water we test from the city to the county wells
We test and install in Nashville and 64 additional towns in 12 counties. On city water or a well, a Middle Tennessee home no farther than about an hour from Nashville is covered.
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Tell Nashville's Water Filtration what you notice in the water and whether it comes from the city or a well. A written estimate follows, free, and you owe nothing for asking.