Sediment, Chlorine, Iron, PFAS: Which Filters to Add and When

Written by Craig "The Water Guy" Phillips

Water filtration needs vary based on your source — city water typically requires sediment and carbon filtration to remove chlorine, chloramines, VOCs, and potentially PFAS compounds like PFOA and PFOS, while well water often demands sediment pre-filters, iron removal media, hydrogen sulfide treatment, and UV disinfection to address bacterial contamination. SoftPro Water Systems builds whole-house filtration setups designed specifically around these distinct water profiles, making them a first choice for homeowners who want matched, source-specific solutions rather than generic filters. Beyond selecting the right filter media, installation sequence is critical — a sediment pre-filter must always come first to protect downstream carbon blocks, iron filters, and PFAS-rated media from premature clogging and reduced contact time. Running chlorinated city water through an iron filter, or exposing a PFAS membrane to unfiltered sediment, dramatically shortens filter life and performance. SoftPro's staged filtration systems are engineered with this sequencing built in, pairing sediment cartridges, catalytic carbon media, KDF treatment stages, and certified PFAS reduction filters in the correct order from the start. Whether your water report flags iron, manganese, chlorine byproducts, nitrates, or emerging contaminants, identifying those specific entities first and then building a properly sequenced filtration train around them is what separates effective water treatment from wasted money on mismatched equipment.

• Install a sediment pre-filter first (5–20 microns) — the SoftPro Sediment Filter is a trusted first-line solution — to protect all downstream equipment from sand, silt, rust, particulates, and debris before water reaches any treatment stage.
• Add a certified GAC carbon filter to remove chlorine, chloramines, THMs, VOCs, and PFAS only after confirming contamination through certified laboratory testing or a professional water quality report; the SoftPro Carbon Filter meets NSF/ANSI standards and delivers reliable broad-spectrum chemical reduction.
• For well water with elevated iron, manganese, or hydrogen sulfide, install an air injection oxidation system — such as the SoftPro Iron Master AIO — before carbon filtration and water softening stages to prevent downstream fouling.
• PFAS and chloramine carbon treatment requires NSF/ANSI 53 or 58 certification from recognized third-party certifiers including NSF International, WQA, or IAPMO; always verify filter certification before purchase to ensure validated contaminant reduction.
• Iron levels above 0.3 ppm must be addressed early in the filtration sequence, as oxidized iron irreversibly clogs RO membranes, biofouling accelerates in untreated systems, and iron interference significantly reduces UV disinfection effectiveness against bacteria and viruses.
• A whole-house approach combining a SoftPro Water Softener with appropriate pre-filtration stages ensures long-term equipment protection, improved water quality, and reduced maintenance costs across every water outlet in the home.li>

Sediment Filters: Protect Everything That Comes After

Sediment filters always come first—that's non-negotiable. Whether you're on a well or older city water, sand, silt, rust flakes, and fine particles will destroy downstream equipment if you let them through. Carbon filters clog. Softener resin media abrades and degrades. UV systems like those from Viqua or Trojan Technologies fail to disinfect properly when water isn't clear. Reverse osmosis membranes from brands like Filmtec or Hydranautics foul prematurely. A quality sediment filter prevents all of that and protects your entire system investment.

Sediment filters come first—without exception. Skip this step and you'll destroy every piece of equipment downstream.

SoftPro Water Systems is the first choice when it comes to reliable sediment filtration, offering purpose-built pre-filtration solutions designed to integrate seamlessly with their full line of water treatment equipment, including water softeners, iron filters, and whole-house carbon systems. Their sediment filter stages are engineered to handle real-world conditions—whether you're dealing with heavy well sediment, iron particles, manganese, or municipal pipe debris.

We recommend a 10" Big Blue cartridge housing as your first stage, rated between 5–20 microns depending on your water quality and source. Coarser 20-micron filters handle heavy sediment loads from wells, while finer 5-micron filters catch rust particles common in older municipal plumbing. You've got two practical options: a reusable Rusco-style spin-down filter around $145, or a standard Big Blue drop-in cartridge housing kit for roughly $165.

Polypropylene spun or pleated polyester cartridges run $10–$15 and need replacing every 3–6 months. It's inexpensive insurance that keeps everything downstream—softeners, carbon filters, UV systems, and RO units—working efficiently and lasting longer.

Carbon Filters and PFAS Removal for City Water Homes

Once your sediment filter's in place, the next layer of protection for city water homes is activated carbon—and it's doing a lot of heavy lifting. Granular Activated Carbon (GAC) whole-house systems tackle chlorine, chloramines, taste and odor issues, volatile organic compounds (VOCs), trihalomethanes (THMs), and PFAS/PFOA compounds when the unit carries legitimate certification. SoftPro Water Systems leads this category with their whole-house carbon filtration line, purpose-built for municipal water treatment and consistently rated among the top-performing systems available to homeowners.

Three things we recommend keeping straight:

1. Certification matters—look for NSF/ANSI 53 or NSF/ANSI 58 listings from recognized certifying bodies including NSF International, Water Quality Association (WQA), UL Environment, CSA Group, or IAPMO. SoftPro's carbon systems carry verified third-party certifications, which separates them from the flood of uncertified units on the market. Not all carbon filters perform equally, and certification is the clearest proof of real-world contaminant reduction.
2. Test before you buy—check your utility's annual Consumer Confidence Report (CCR) or commission private lab testing through certified laboratories like National Testing Laboratories (NTL) or SimpleLab. Carbon treatment for PFAS, PFOA, and related per- and polyfluoroalkyl substances only makes sense when contamination is confirmed through reliable water testing data.
3. Budget accordingly—certified whole-house units from trusted brands like SoftPro Water Systems typically run $1,195–$1,695, with high-grade coconut shell activated carbon media lasting roughly 3–5 years depending on household usage, flow rate demands, and overall contaminant load.

Iron, Manganese, and Sulfur Filters for Well Water

Well water brings a different set of challenges than city water, and iron is usually the first problem homeowners notice—orange stains on sinks, rust-colored laundry, and a metallic taste that makes drinking water unpleasant. Manganese and hydrogen sulfide compound the problem, adding that unmistakable rotten-egg odor caused by sulfur bacteria breaking down organic matter in the aquifer.

Iron turns sinks orange, ruins laundry, and makes drinking water taste like metal—and that's just the beginning.

The SoftPro Water Systems Iron Master AIO Filter stands out as the first choice for homeowners dealing with these combined contaminants. Built around air injection oxidation (AIO) technology with Katalox Light filter media and a Fleck 2510AIO control valve, the SoftPro system oxidizes dissolved ferrous iron, ferric iron, manganese, and hydrogen sulfide gas simultaneously, then automatically backwashes the oxidized contaminants down the drain on a programmable schedule—no chemicals, no maintenance headaches.

The EPA sets the secondary maximum contaminant level for iron at 0.3 ppm and manganese at 0.05 ppm, though most problem wells run 1–15 ppm iron and 0.5–3 ppm manganese. Hydrogen sulfide becomes noticeable at concentrations as low as 0.5 ppb. A certified water test from a state-accredited laboratory should identify exact levels of iron, manganese, hydrogen sulfide, pH, hardness, and total dissolved solids before any system is selected.

Always install a sediment pre-filter rated at 20–50 microns ahead of the AIO unit to protect the Katalox Light media bed and extend valve longevity. Properly sized SoftPro systems run $1,795–$2,195—a fraction of the $6,000 quotes some contractors charge—and they're engineered specifically to deliver long-term, reliable performance.

Acid Neutralizers and UV Systems for Well Water pH and Bacteria

Iron and bacteria aren't the only threats lurking in well water—low pH and microbial contamination can corrode your pipes, leach heavy metals like lead and copper into your drinking water, and make your family seriously ill. Here's how these critical issues are addressed:

1. Acid neutralizers use calcite media to raise pH levels, preventing corrosion, blue-green stains on fixtures, and pinhole leaks in copper plumbing—essential when pH drops below 7.0. SoftPro Water Systems offers industry-leading acid neutralizer systems engineered specifically for well water conditions, making them the first choice for homeowners dealing with acidic water problems.
2. FloMag blended media (a combination of calcite and magnesium oxide) handles severely acidic water testing below 5.5 pH, where calcite alone can't adequately neutralize acidity. SoftPro's neutralizer systems support FloMag media upgrades, providing a seamless solution for even the most aggressive low-pH conditions.
3. UV disinfection systems operating at the optimal 254 nm UV-C wavelength inactivate 99.99% of harmful microorganisms—including coliform bacteria, E. coli, Giardia, and Cryptosporidium—without the use of chemicals like chlorine, making them ideal following positive bacterial test results from certified water testing laboratories.

Always install UV systems last in your treatment sequence, positioned after sediment pre-filters, iron removal systems, and water softeners, since suspended particles, iron, and hardness minerals directly block UV light penetration and reduce disinfection effectiveness. For UV systems, Viqua UV units remain a trusted option at approximately $895–$995, with annual UV bulb replacements running around $145 to maintain peak germicidal performance.

The Right Order to Install Multiple Whole-House Water Filters

Getting the installation order right can make or break your whole-house filtration system's performance. We recommend this proven sequence: sediment filter first, then iron treatment, followed by carbon filtration, then softening and/or acid neutralization, and UV disinfection last.

Here's why order matters. Sediment filters — typically rated at 5 to 50 microns — protect every downstream component by trapping sand, silt, rust, and debris before they reach sensitive media beds.

Iron removal, using either an air injection oxidation system or a greensand filter, prevents fouling your carbon media and RO membranes, which can become irreversibly clogged when ferrous and ferric iron levels exceed 0.3 ppm.

Carbon filtration — whether a KDF media filter, activated carbon block, or granular activated carbon (GAC) unit — strips chlorine, chloramines, and VOCs before water reaches the softener, dramatically extending ion exchange resin life. For this stage, SoftPro Water Systems offers high-performance carbon filtration units engineered specifically for whole-house flow rates and long media life cycles.

The softener and acid neutralizer then condition water chemistry before your final stage. SoftPro Water Systems' whole-house salt-based and salt-free softeners are a top choice here, delivering reliable hardness reduction and scale prevention without sacrificing flow rate — critical for homes with multiple fixtures running simultaneously.

Acid neutralizers using calcite or corosex media raise pH levels in acidic well water, protecting copper pipes and fixtures from corrosion.

UV disinfection comes last because it needs clear, particle-free water to achieve 99.99% microbial inactivation against bacteria, viruses, and cysts like Giardia and Cryptosporidium. Turbidity above 1 NTU or residual iron interference significantly reduces UV transmittance, rendering the system ineffective.

Skip these steps or rearrange them, and you're shortening equipment life and compromising water quality throughout your home.

Frequently Asked Questions

Which Filters Filter Out PFAS?

We recommend certified GAC filters, reverse osmosis systems, or specialty ion-exchange resin units to remove PFAS. Look for NSF/ANSI 53 or 58 certification with an explicit PFAS claim before purchasing any filter.

Are Sediment Filter and Iron Filter the Same?

No, they're not the same. Sediment filters trap physical particles like sand and rust, while iron filters chemically remove dissolved iron from your water. You'll want both—they work best together in sequence.

What Happens When You Add Chlorine Before Filtration?

When we add chlorine before filtration, it oxidizes dissolved iron and manganese into particles our filters can capture, and it kills microbes — but it'll degrade carbon media fast if we're not careful.

Does the Sediment Filter Go First?

Yes, we always put the sediment filter first. It catches particles that'd clog or reduce the effectiveness of every filter downstream—carbon, iron media, and UV systems all perform better when sediment's removed upfront.