Video · Tap Water Quality
Home Water Test: A Drop Test for Hardness, Step by Step
A home water test shows how hard your water is, meaning how much dissolved mineral it carries, before you ever see scale on a faucet. This clip walks through a drop-reagent test from sample to reading.
Job footageSwiftPro
- Topic
- Tap Water Quality
- Length
- 0:33
- Posted
- September 13, 2026
- Shot by
- The SwiftPro crew, Northern Virginia
What you’re seeing in this video
Water runs from a kitchen faucet into a stainless sink to collect a sample. Then a SwiftPro tech in a black hoodie kneels beside a water heater in the utility room with a drop-reagent test kit.
The steps on screen are the whole method: collect the sample, add the reagent, watch the color change, read the hardness. With a drop test, the number of drops it takes to change the sample's color gives the reading, usually in grains per gallon.
Testing next to the water heater makes sense. That's the appliance hard water hits hardest.
Why it matters in your house
- Hard water leaves white crust on faucets and shower heads, spots on dishes, and a layer of scale in the bottom of your water heater that makes it work harder.
- A test number turns a guess into a decision. It tells you whether a softener makes sense, or whether a simple filter or a regular water heater flush is enough.
- SwiftPro tests both city tap water and well water in Northern Virginia. Well owners should test every year, since nobody else is checking that water for you.
What does a home water test show?
A basic test like this one measures hardness, the calcium and magnesium in your water. Fuller tests add chlorine, pH, iron and dissolved solids, and well water tests check for bacteria too. If you're seeing scale, stains or an odd taste, a test tells you the cause instead of leaving you to guess at products.
Want it done at your place? See Tap Water Quality at SwiftPro or call (703) 997-9757.
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