SpringWell sulfur filter review

Best for

Wells with hydrogen sulfide up to the published 8 ppm, iron up to 7 ppm and manganese up to 1 ppm, pH 6.5 or higher, and a clean bacteria test.

Wrong fit

Water above any published limit, pH below 6.5, coliform or heavy sulfur or iron bacteria, tannins, and homes where only the hot water smells.

Tradeoff

No chemicals to refill, but it needs a drain, power and a nightly backwash, it doesn't disinfect, and the money-back guarantee applies to unused, uninstalled systems.

What it is and how it works

SpringWell’s Whole House Well Water Filter System, sold as the WS1 and WS4, is an air-injection oxidizing filter in a single tank. SpringWell describes three steps:

1. Oxidation. Water passes through an oxygen-rich air pocket at the top of the tank, which converts dissolved iron, sulfur and manganese into solid particles.
2. Filtration. A “greensand fusion” media bed catches those particles.
3. Backwash. Each night, a scheduled backwash flushes the trapped particles down a drain and refreshes the air pocket.

Nothing is added to the water, so there’s no chemical tank to refill. The control head has Bluetooth control. SpringWell calls the process patented; we didn’t verify the patent.

This review is based on SpringWell’s published specifications and policies and on extension guidance about this type of equipment. We haven’t installed or tested the unit.

Published limits

From SpringWell’s product page, as of 2026-11-12:

For context, 8 ppm is high for this kind of equipment. Penn State Extension says plain aeration is normally not used above about 2 mg/L, and extension figures for oxidizing filters range from 2 to 3 mg/L (Penn State) to about 6 mg/L (Minnesota) to 10 ppm (UGA). Those sources describe related, not identical, equipment, and SpringWell’s figures are its own specifications, not independent test results.

Who it fits

• Hydrogen sulfide from the well, with a steady smell in hot and cold water at every tap, and a test result inside 8 ppm.
• Sulfur plus iron or manganese, with each inside its published limit. One tank handles all three. See sulfur and iron in well water.
• Owners who don’t want chemicals. There’s nothing to refill.
• Homes with a drain and outlet near the pressure tank and enough room for a 64-inch-tall unit.

Who it doesn’t fit

• Levels above the limits. Above 8 ppm H2S, 7 ppm iron or 1 ppm manganese, look at chlorine injection with a contact tank. Penn State says chlorination can handle any level and is most often used above 6 mg/L. SpringWell sells a separate chemical injection system for that.
• Low pH. Below pH 6.5 the water is outside the unit’s range. Raise pH first.
• Bacteria. SpringWell’s spec page says not to use the system where water is microbiologically unsafe. It oxidizes and filters; it doesn’t disinfect.
• Sulfur bacteria that keep coming back. Minnesota says sulfur bacteria can be hard to remove once established. If the smell is strong when a tap opens and then fades, shock chlorinate first and see whether you need a filter at all.
• Tannins. The product page doesn’t list tannin removal. SpringWell sells a separate tannin system.
• Hot-water-only smell. The water heater is making the gas, and no whole-house filter fixes that. See hot water smells like rotten eggs.
• Several limits at once. SpringWell lists the iron, H2S and manganese limits separately. It doesn’t say whether all three can be at maximum together. If two of your numbers are near the top, ask SpringWell in writing.

Installing and maintaining it

Before you buy, check that your house can take one:

• Drain for the nightly backwash. A drain line is included.
• Power. A power supply is included; you need a nearby outlet.
• Space: about 64 inches of height with the head, and a 10- or 13-inch tank footprint.
• Pressure between 25 and 80 psi and water between 36 and 120°F.
• Plumbing: 1-inch connections. MNPT fittings and a hose clamp are included. SpringWell adds a bypass valve to the cart by default, which you can remove.
• Pump capacity. Backwash needs adequate flow from your well. Ask SpringWell what backwash flow the unit needs and compare it with your pump.
• Licensing. Some states require a licensed plumber or water conditioning contractor. Minnesota advises checking an installer’s license.

After that, the unit backwashes automatically each night. Owner jobs are to check that backwash runs, keep the drain line clear and unfrozen, change any sediment pre-filter, and watch for a returning smell, which is usually the first sign of a problem. SpringWell claims more than 10 years of media life; that’s a manufacturer claim, and real media life depends on your water.

Buying, returns and warranty

A test comes first. SpringWell’s product page says it holds all well-system orders until water test results are complete. If you don’t have current results, it adds a well water test (Level 1 plus bacteria) as a required add-on. If the results show the system isn’t compatible with your water, SpringWell says it will cancel the order and issue a full refund, but water tests are non-refundable.

That’s a reasonable policy, and it matches extension advice to test before buying. Check that your test includes hydrogen sulfide. SpringWell’s own test kit page lists 53+ contaminants including heavy metals, nitrates and bacteria, but doesn’t name hydrogen sulfide. See how to test for hydrogen sulfide.

Warranty and returns, as stated on SpringWell’s pages on 2026-11-12:

• Lifetime warranty against defects in material and workmanship on covered items, including fittings, tanks, housings, bypass, valves and in/out heads, under normal use.
• Limited warranties: 10 years on retention and mineral tanks 14 inches or larger (the WS1 and WS4 tanks are 10 and 13 inches), and a limited warranty on solid-state electronic heads. The product page says 5 years for the heads; SpringWell’s separate warranty page says 7 years. Ask which applies to your purchase.
• What voids it: installing on water beyond the system’s recommended specification, failing to replace media on time, moving the system from its original location, or not being the registered owner living in the home. SpringWell’s liability is capped at the product’s cost, and the warranty page says SpringWell isn’t responsible for plumber fees.
• 6-month money-back guarantee: shown as a badge on the product page. The return policy on the same page says returns are accepted within six months for unused, uninstalled items in undamaged packaging, minus original shipping, with a 10% restocking fee on approved non-defective returns. Installed systems aren’t eligible unless SpringWell determines they’re defective. For installed systems, SpringWell describes a “6-month Performance Promise” of troubleshooting, replacement parts or other remedies.

In practice, the refund route is for a system you haven’t installed. Once it’s plumbed in, your protection is the performance promise and the defect warranty, which is why matching your test results to the published limits before you buy matters.

What we couldn’t verify

• Certification. The product page doesn’t state an NSF or WQA certification for this system. Check the official NSF and WQA listings before relying on any claim.
• Independent performance data at 8 ppm H2S, or with iron and H2S both near their limits.
• The patent SpringWell mentions.
• Media life beyond SpringWell’s own claim.
• Flow ratings. The spec table lists 12 GPM (WS1) and 20 GPM (WS4), but a size guide on the same page lists different flow figures for sizes called Core, Pro and Max. We used the spec table.
• Electronic head warranty: 5 years on the product page, 7 years on the warranty page.
• Backwash water use per cycle, which matters on septic systems and low-yield wells.

How it compares

See the treatment-by-level table and the air-injection filter guide for more on each.

Bottom line

If your test shows hydrogen sulfide, iron and manganese inside SpringWell’s published limits, pH of 6.5 or higher and no bacteria, this is a sensible chemical-free option, and SpringWell’s test-first policy reduces the risk of buying the wrong system. You can check current details on SpringWell’s well water filter page. If any number is outside those limits, or the smell is only in the hot water, it’s the wrong tool.

SpringWell sells direct to consumers. We earn a commission if you buy through links on this site. That doesn’t change the limits and caveats above, which come from SpringWell’s own published pages and the extension sources listed below.