Whole-House Water Filtration Guide for Maryland Well Owners

Start With a Water Test

Before buying any equipment, test your water. A comprehensive water test for Southern Maryland well water should include: iron, manganese, pH, hardness, sulfur/hydrogen sulfide, total dissolved solids, total coliform, E. coli, and nitrates.

We test water on-site before recommending any treatment. The results determine which components you need, what size each component should be, and in what order they should be installed. Skipping the test and buying a generic package is how homeowners end up with systems that don't work.

The Components of a Whole-House System

1. Sediment Pre-Filter

A sediment filter is the first component in any whole-house system. It removes sand, silt, rust particles, and other suspended solids before they reach downstream equipment. Sediment damages pump impellers, clogs filter media, and reduces UV effectiveness.

Typical sizing: 5–20 micron cartridge filter. Change every 3–6 months depending on sediment load.

2. Acid Neutralizer

If your pH is below 6.5, an acid neutralizer is the second component. It raises pH to 7.0–7.5 by dissolving calcite (calcium carbonate) media as water flows through.

Why second? Because iron filters and water softeners work better at neutral pH. Acidic water also damages softener resin over time. Raising pH first protects all downstream equipment.

Note: acid neutralizers add hardness to the water (the calcite dissolves into calcium). This is why a softener comes after, not before.

3. Iron & Manganese Filter

If your iron is above 0.3 mg/L or manganese above 0.05 mg/L, an iron filter is the next component. Iron filters use oxidation and filtration to remove dissolved iron and manganese before they reach your fixtures and appliances.

Common media types: birm, greensand, catalytic carbon, or air injection systems. The right choice depends on your iron type (ferrous vs. ferric), iron level, pH, and whether manganese is present.

Iron filters backwash automatically to clean the media bed. Backwash water goes to a drain — make sure your system has adequate drain capacity.

4. Water Softener

If your hardness is above 7 grains per gallon (120 mg/L), a water softener removes calcium and magnesium through ion exchange, replacing them with sodium.

The softener comes after the iron filter because iron fouls the softener resin — even small amounts of iron will coat the resin beads and reduce softening capacity over time.

Softeners require salt (sodium chloride or potassium chloride) and regenerate periodically. Properly sized for your household, a softener uses 6–10 lbs of salt per regeneration.

5. UV Disinfection

If your water tests positive for bacteria, or if you have a shallow well or other contamination risk, UV disinfection is the last component before the water enters your home's distribution system.

UV must be last — it only works in clear water. All upstream filtration removes the turbidity and iron that would otherwise shield bacteria from the UV light.

6. Reverse Osmosis (Point of Use)

A reverse osmosis system at the kitchen sink provides the highest quality drinking water — removing nitrates, arsenic, fluoride, and other contaminants that whole-house systems don't address. RO is a point-of-use system, not whole-house.

The Order of Operation Matters

The sequence above isn't arbitrary — it's engineered. Installing components in the wrong order causes equipment failure, reduced effectiveness, and wasted money. We've diagnosed systems where:

• A softener was installed before an iron filter — the resin was fouled with iron within 2 years
• UV was installed before filtration — providing essentially no disinfection
• An acid neutralizer was installed after a softener — the acidic water was damaging the resin

Proper system design is as important as the equipment itself.

What Does a Whole-House System Cost?

Cost depends on your water chemistry and which components you need:

• Sediment filter only: contact us for a free estimate installed
• Acid neutralizer: contact us for a free estimate installed
• Iron filter: contact us for a free estimate installed
• Water softener: contact us for a free estimate installed
• UV system: contact us for a free estimate installed
• Full system (all components): contact us for a free estimate installed

We provide a written estimate before any work begins. No surprises.

Next Steps

Call Deep Dive Plumbing Maryland at (443) 440-0632 to schedule a water test and system evaluation. We test your water on-site, explain the results in plain language, and design the right system for your specific water chemistry — in the correct order of operation.