Raises low pH in well water that also has iron above 0.5 ppm or heavy sediment: the valve backwashes on a timer to rinse them out of the calcite. No iron and clear water? The non-backwashing Clack 2.5 does the pH job for $700 less.
Watch This Before BuyingMeet Aidan, your water treatment expert
Raises low pH in well water that also has iron above 0.5 ppm or heavy sediment: the valve backwashes on a timer to rinse them out of the calcite. No iron and clear water? The non-backwashing Clack 2.5 does the pH job for $700 less.
Watch This Before BuyingMeet Aidan, your water treatment expert
Backwashing or non-backwashing?I'm the guy in the videos. Text me your water test. If your iron is 0.5 ppm or less and the water is clear, I'll tell you to save the $700 and get the non-backwashing tank. If you need this one, I'll tell you the size, the FloMag blend and the backwash setting.
Complete 2.5 Cubic Foot Backwashing Acid Neutralizer System
✓2.5 cubic foot Vortech tank (13" x 54"): about 62" tall with the valve; ships empty
✓Fleck 2510 backwash control valve: a digital timer runs the backwash on the days set in the valve. Orders now ship with the 2510 AiQ, Pentair's replacement for the discontinued 2510SXT shown in the photos
✓Bypass valve: turned to bypass, water goes around the tank while it is serviced
✓Plug-in transformer: powers the valve from a standard outlet
✓5 x 50 lb boxes of calcite (250 lb): loaded into the tank at install
✓1 bag of FloMag (calcite + FloMag variant only): mixed into the calcite at install, in the amount Aidan sets from your water test
✓Fill funnel: for loading and topping off the calcite
✓Free freight shipping to the lower 48 states
Backwashing is for low pH plus iron or sediment. Choose this tank when your pH is below 7 and your water test shows iron above 0.5 ppm, or heavy sediment that clogs a sediment filter every day or week. With neither, the Clack 2.5 non-backwashing raises pH the same way with no drain line and no electricity, for $700 less. One or two people at pH 6.0 and up, with iron: the 2510SXT 1.5 backwashing. Not included: drain tubing, pipe and fittings (your plumber supplies them). Not sure? Text your water test to Aidan at 443-277-2204.
System Model
Fleck 2510 2.5 cu ft Vortech Backwashing (13 x 54)
Control Valve
Fleck 2510 backwash filter valve by Pentair, on a day timer (orders now ship with the 2510 AiQ, the replacement for the discontinued 2510SXT)
Best For
pH below 7 with iron above 0.5 ppm or heavy sediment; 3 or more people, or any pH below 6.0
Flow Rate Capacity
Up to about 15 GPM (our rating for this tank)
pH Treatment
5.5 to 6.9 with calcite (neutralizes to about 7); below 5.5, the FloMag variant
Dimensions
13" x 54" tank, about 62" tall with the valve
Connections
1" on the bypass valve; your plumber supplies adapters to match your pipe
Media Included
250 lb calcite (5 x 50 lb boxes), loaded at install; the tank ships empty
Backwash
Every 7 days with no iron, every 2 to 3 days with iron (Aidan sets it); about 140 gallons to the drain each time
Well Flow for Backwash
About 5 to 7 GPM; a slower well gets a longer backwash
Maintenance
Check the level once a year with a flashlight; add 1 to 2 boxes of calcite about every 30 to 36 months
Requirements
Standard outlet + a 1/2" drain line with an air gap (tubing not included)
Hardness Impact
About +3 to 6 grains per gallon
Warranty
10 Yr Tank / 5 Yr Valve
🔧
We recommend having a plumber install it: about 2 to 3 hours, typically around $800. Plumbing it in is an inlet and an outlet; the part that takes planning is the 1/2 inch drain line to a floor drain, standpipe or utility sink, with an air gap. Aidan supports your plumber by phone at 800-460-5810. If you'd rather do it yourself, text Aidan at 443-277-2204 with any questions.
🔌 PowerA standard outlet near the valve, not a switched outlet. The valve plugs in through its transformer.
🚰 Drain lineNot included. A 1/2 inch line from the valve drain to a floor drain, utility sink or standpipe, ending above it with an air gap. Your plumber sizes it up for a long run.
💧 Well flowAbout 5 to 7 gallons a minute while it backwashes. A slower well still works: Aidan sets a longer backwash.
📍 PlacementAfter the pressure tank (it needs the pressure to backwash) and after the sediment filter.
Installation Steps
Shut off the main water supply and relieve the pressure at a faucet
Load the five boxes of calcite into the empty tank with the included funnel. On the FloMag variant, mix in only the amount of FloMag Aidan sets from your test
Plumb the bypass valve into the main line after the pressure tank and the sediment filter: water enters the inlet and leaves the outlet to the house
Run the drain line (not included) from the valve drain to a floor drain, utility sink or standpipe, with an air gap, and secure its end: the backwash comes out hard
Plug the valve into a standard outlet and set the time of day. It ships set to backwash every 3 days; Aidan gives your plumber the setting for your water. If the screen opens on a setup menu, call Aidan before choosing anything
Open the bypass slowly to fill the tank. Run a manual backwash to settle the bed and purge the air, checking the drain connection while it runs, then put it in service and run cold water until it is clear of calcite dust
Where It Goes
On the main water line after the pressure tank and the sediment filter. If you also have an iron filter or a softener, Aidan sets the order from your water test.
Backwash timing: Set the backwash for a time when no water is being used, such as 2:00 AM. A backwash and a rinse of about 10 minutes each is typical, and about 140 gallons go to the drain each time. If you also have a softener, set them to start at different times.
The valve rinses the calcite on a timer. Your job is checking the level once a year and adding calcite every few years. Calcite is never replaced: it dissolves as it raises the pH.
Maintenance Schedule
AutomaticBackwash on the days set in the valve. Every 7 days with no iron, every 2 to 3 days with iron; Aidan sets it for your water. Each backwash sends about 140 gallons to the drain and rinses trapped iron and sediment out of the calcite. It does not lift or regrade the bed, which is too heavy to move.
YearlyCheck the calcite level and the drain line. Hold a flashlight behind the tank in a dark room to see the level, and make sure the drain line is clear and not kinked.
About every 30 to 36 monthsAdd calcite. When the level is about halfway down, add more through the fill port with the funnel, usually 1 to 2 boxes, to about 10 inches below the top. That space lets the backwash rinse the bed.
About every 4 to 6 monthsChange the sediment cartridge if a 20" Big Blue filter sits ahead of the tank (5 micron replacement cartridge, $55).
Vortech® Technology uses a patented internal distributor system to maximize media contact, reduce channeling, and deliver consistent treatment across the entire tank.
The result is higher efficiency, longer media life, and reliable performance without unnecessary complexity or wasted capacity.
13x54 Vortech Tank
Internal distributor plate, no gravel. Semi-translucent, so you can check the calcite level with a flashlight.
5-Year Warranty
On the Fleck control valve, against manufacturer defects.
Orders are verified and sent to our Ohio facility. Your system is picked, palletized, and shrink-wrapped in secure, damage-resistant packaging.
Freight Shipment
In stock systems typically ship within 3 to 5 business days. We use heavy freight carriers (usually RNL). You will receive a tracking number via email.
Transit Time
Free shipping to the lower 48 states.
• 1–2 business days (East Coast/Midwest)
• 4–5 business days (West Coast)
Liftgate Delivery
Due to the weight, delivery is via liftgate truck to your driveway or curb.
Why isn't this 1-day shipping like Amazon?
Unlike a standard Amazon package, this shipment is heavy and gets delivered on a pallet. It requires specialized pallet handling, tractor-trailers, and liftgates to ensure it arrives safely. We prioritize damage-free delivery over speed.
"I never give reviews but this product was 5 stars from start to finish. So refreshing to deal with a product and company that lives up to what they advertise." ★★★★★
Jack S, Maryland
"Easy installation, excellent water flow, wish I had bought this 20 years ago. - Feb 7th 2026" ★★★★★
Joe H, Pennsylvania
Video Guides
Two short videos: which type of acid neutralizer you need, and which size.
⚖️ Backwash or Not?
↔ Sizing Guide
Customer Installs
Real installations from real homeowners
"Well made, simple install."
- Nicolas C.
"Easy to install and amazing customer service."
- Darren P.
"Install was straightforward and fairly easy."
- Clayton B.
The Backwashing Neutralizer for Low pH With Iron or Sediment
10-year tank, 5-year valve warranty. Sized from your water test.
The 2.5 cubic foot backwashing acid neutralizer raises the pH of acidic well water with 250 pounds of natural calcite in a 13 x 54 inch Vortech tank. Water comes out near neutral, which stops blue-green stains and the corrosion behind pinhole leaks. On the days set in the Fleck 2510 valve, it backwashes, rinsing trapped iron and sediment out of the calcite and sending about 140 gallons to a drain. That makes it the tank for a pH below 7 with iron above 0.5 ppm, or heavy sediment that clogs a sediment filter.
It needs a standard outlet, a 1/2 inch drain line, and a well that supplies about 5 to 7 gallons a minute during the backwash. With no iron and clear water, the non-backwashing Clack 2.5 does the same pH job for $700 less. The 2.5 fits three or more people or any pH below 6.0; below 5.5, choose the FloMag variant.
✔Automatic Backwash
✔Fleck 2510 Valve
✔13x54 Vortech Tank
✔Up to 15 GPM
✔Free Shipping
Feature
Our System
Others
Media Capacity
✔
2.5 Cubic Feet (Massive)
1.0 - 1.5 Cubic Feet
Chemicals Required
✔
None (Natural Calcite)
Some use hazardous chemicals
Plumbing Protection
✔
Stops the Corrosion Behind Pinhole Leaks
Variable / Less Contact Time
Tech Support
✔
Lifetime Expert Video/Phone
Limited or No Support
Warranty
✔
10 Years Tank / 5 Years Valve
1-3 Years Limited
Media Capacity
✅ Us2.5 Cubic Feet (Massive)
❌ Them1.0 - 1.5 Cubic Feet
Chemicals Required
✅ UsNone (Natural Calcite)
❌ ThemSome use hazardous chemicals
Plumbing Protection
✅ UsStops the Corrosion Behind Pinhole Leaks
❌ ThemVariable / Less Contact Time
Tech Support
✅ UsLifetime Expert Video/Phone
❌ ThemLimited or No Support
Warranty
✅ Us10 Years Tank / 5 Years Valve
❌ Them1-3 Years Limited
✔ Free Tech Support
Buy with us and you have Aidan to call at 800-460-5810 or text at 443-277-2204, 7 days a week from 8 AM to 5 PM Eastern, for the backwash setting, calcite top-offs, FloMag, or questions while your plumber puts it in.
📞 Call Us800-460-5810
✉️ Email Supportsupport@midatlanticwater.net
🕒 Live Hours7 Days/Week, 8 AM to 5 PM ET
Frequently Asked Questions
Only if your pH is below 7 and your water test shows iron above 0.5 ppm, or heavy sediment that clogs a sediment filter every day or week. The backwash rinses that iron and sediment out of the calcite, which a non-backwashing tank cannot do. With neither, the non-backwashing Clack 2.5 raises pH the same way with no drain line and no electricity, for $700 less, and it is what nearly all of Aidan's acid neutralizer customers buy. Text your water test to Aidan at 443-277-2204 and he will tell you which one fits.
We recommend one. Plumbing it in is an inlet and an outlet; the part that takes planning is the 1/2 inch drain line to a floor drain, standpipe or utility sink, with an air gap, plus a standard outlet for the valve. It is about 2 to 3 hours of a plumber's time, typically around $800, and Aidan supports your plumber by phone at 800-460-5810. If you'd rather do it yourself, you can; text Aidan at 443-277-2204 with any questions.
About 140 gallons go to the drain each time. The valve ships set to backwash every 3 days; with no iron, Aidan has it set to every 7 days, and with iron every 2 to 3 days. Your well needs to supply about 5 to 7 gallons a minute during the backwash; with a slower well, Aidan sets a longer backwash. Some owners on a septic system choose the non-backwashing tank to keep that water out of it.
The Fleck 2510 AiQ. Pentair, the company that makes Fleck valves, discontinued the 2510SXT and replaced it with the 2510 AiQ, and orders now ship with it. In Aidan's words, "It's easier to program and does the same job." It is a digital valve that plugs into a standard outlet.
Check the level once a year: hold a bright flashlight behind the tank and look for the shadow of the calcite. When it is about halfway down, add calcite with the included funnel, filling to about 10 inches below the fill port. How long that takes depends on the tank size: about every 6 to 12 months on a 1.0 cubic foot tank, 18 to 24 on a 1.5, 24 to 30 on a 2.0 and 30 to 36 on a 2.5. A calcite and FloMag blend does not change it. You never replace the calcite; it dissolves as it works.
Not noticeably. The Vortech tank has no gravel bed, and its distributor plate spans the whole tank. Pressure drop is not something our customers call about. Rated flow depends on the size (the 2.5 cubic foot non-backwashing tank is rated up to 17 GPM), and this model's number is in the specifications tab above.
The unit ships via freight truck with liftgate service. The driver will lower the pallet to your driveway or curb. You are responsible for disposing of the wooden pallet and cardboard packaging. The tank itself is lightweight when empty and easy to move into your garage or basement before filling it with the included media.
Customer Reviews
5.0Based on 6 Reviews
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Fleck 2510SXT 2.5 Cubi...$2,195.00
Investing in The Right System
Cheap backwashing neutralizers look identical online, but they cut corners where it matters.
Found this neutralizer cheaper somewhere else?
Cheap backwashing acid neutralizers sold online for $800-1,000 typically use:
Low-cost control valves (not genuine Fleck) that fail within 2-3 years, requiring a $400-600 replacement valve and a plumber visit.
Incomplete calcite fill (sometimes only 50-100 lbs in a 2.5 cu ft tank) so the system underperforms from day one.
No bypass valve, no fill funnel, and no technical support. You are on your own if something goes wrong.
The True Cost Over Time
Cheap Alternative
$900 Upfront
❌Lifespan: Fails in 3-4 years
❌Result: Frequent repairs, poor water quality, leaks
❌Support: None
~ $0.62 / Day
Best Long-Term Value
Our Premium System
$2,195 Upfront
✅Lifespan: Lasts 15+ years, with calcite topped off about every 30 to 36 months
✅Result: Water near neutral (about pH 7), with iron and sediment rinsed out to the drain
✅Support: Lifetime USA Support
~ $0.40 / Day
Do it right the first time. By investing a little more upfront, you prevent early replacement costs, plumbing repair headaches, and the frustration of poor water quality. This is without a doubt the best long-term option for your home.
What You're Actually Paying For
Genuine Fleck 2510 backwash valve by Pentair (orders now ship with the 2510 AiQ, the replacement for the 2510SXT), with a 5-year valve warranty.
13 x 54 inch Vortech tank with a 10-year tank warranty.
Full calcite fill included: five 50 lb boxes (250 lb), loaded at install.
Bypass valve and fill funnel included. Plus lifetime phone support from Aidan at 800-460-5810.
Contact Us
800-460-5810
We're here to help.
1-Year Risk-Free Guarantee
Proven in Thousands of Real Homes
The Policy:
If it doesn’t fix your acidic water, we’ll refund you. No returns required.
After 30 years of testing acidic water solutions, the data led us to this exact system. With a track record of 1,000+ successful installations, we have the evidence to offer a true risk-free guarantee based on results, rather than an empty marketing gimmick.
The Industry "Return Policy" Trap
+
Most water filter companies offer standard "Money Back Guarantees" or return policies fully knowing that you aren't going to drain, package, and pay heavy freight costs to ship a 600lb wet tank back to them. It's an illusion of safety. Our guarantee requires zero return shipping.
How Our Real Guarantee Works
1
It Fails to Fix the Acidic Water
If the system does not neutralize your pH as promised.
2
Aidan Troubleshoots With You
You'll work directly with the expert who designed your system to ensure it's set up correctly for your specific well chemistry.
You Get Refunded
If it still doesn't solve the problem, we refund you entirely. No return shipping required.
Not sure if this is the perfect system? Don't guess. If you aren't 100% sure this is the correct size for your well, text me your water test or call me directly. I'll personally review it.