Calcite Acid Neutralizer Media for Water Treatment, 50 lb Box
Granular calcite for acid neutralizer tanks. It raises acidic well water to about pH 7.0 to 7.5 and stops there. Ships as one 50 lb box.
💡How many boxes do you need?▾
Topping off (the calcite is about half gone): about 1 box for a 1.0 or 1.5 cu ft tank, 1 to 2 boxes for a 2.0 or 2.5.
Filling an empty tank: 2 boxes for a 1.0 cu ft tank, 3 for a 1.5, 4 for a 2.0, 5 for a 2.5, 7 for a 3.5. The 3‑box ($395), 4‑box ($495) and 5‑box ($595) packs cost less per box.
pH below 5.5, or below 6.0 in a 1.0 or 1.5 cu ft tank? You also need FloMag mixed in. Not sure? Text Aidan your pH and tank size at 443-277-2204.
Calcite Acid Neutralizer Media for Water Treatment, 50 lb Box
Granular calcite for acid neutralizer tanks. It raises acidic well water to about pH 7.0 to 7.5 and stops there. Ships as one 50 lb box.
💡
How many boxes do you need?
Topping off (the calcite is about half gone): about 1 box for a 1.0 or 1.5 cu ft tank, 1 to 2 boxes for a 2.0 or 2.5.
Filling an empty tank: 2 boxes for a 1.0 cu ft tank, 3 for a 1.5, 4 for a 2.0, 5 for a 2.5, 7 for a 3.5. The 3‑box ($395), 4‑box ($495) and 5‑box ($595) packs cost less per box.
pH below 5.5, or below 6.0 in a 1.0 or 1.5 cu ft tank? You also need FloMag mixed in. Not sure? Text Aidan your pH and tank size at 443-277-2204.
Aidan Walsh32 years in water treatment8 AM to 5 PM Eastern
I'm the guy in the videos. Text or call me and I'll help you figure it out. No bots, no call center.
Text me from your phone
Scan this with your phone's cameraIt opens a text message to me with your question already started. Just hit send.Or text 443-277-2204
"I have a vortex tank and other brands would flush out of the system during the backwash cycle. This calcite is more dense and stays in the tank." ★★★★★
Richard D., Verified Buyer
"Compared to neighbors with similar well water, calcite is more reliable on holding the Ph around 7 for longer than other products. It might give you pain having white residue on your cookware or appliances, but in my opinion it well worth having that trouble over drinking and showering in acid water." ★★★★★
Sharon G., Verified Buyer
"I am quite happy with this calcite purchase.The price was reasonable and the granularity is more pebble like than powder like, exactly what I was looking for. The color is not pure white but slightly grayish. I will buy it again." ★★★★★
Gregory J., Verified Buyer
"Fair price on calcite, fast shipping. More importantly, Aiden is always there when you need any kind of technical question answered, even on a Sunday afternoon.." ★★★★★
John D., Verified Buyer
Boxes per tank
Tank
Fill from empty
Top-off at half down
Typical time between top-offs
1.0 cu ft (10 x 44 in)
2 boxes
about 1 box
6 to 12 months
1.5 cu ft (10 x 54 in)
3 boxes
about 1 box
18 to 24 months
2.0 cu ft (12 x 52 in)
4 boxes
1 to 2 boxes
24 to 30 months
2.5 cu ft (13 x 54 in)
5 boxes
1 to 2 boxes
30 to 36 months
3.5 cu ft (14 x 65 in)
7 boxes
ask Aidan
ask Aidan
Filling from empty? The 3-box pack ($395), 4-box pack ($495) and 5-box pack ($595) cost less than buying single boxes at $145. Our complete neutralizers already ship with a full fill of calcite, loaded at install.
How long a fill lasts depends on how acidic the water is and how much the house uses: very low pH and heavy use shorten it, and a weekend house goes longer because calcite does not dissolve while no water is moving. The months above are typical, not a schedule. Check the level once a year.
Will it work in my tank?
Any calcite acid neutralizer tank, any brand
Yes. Upflow (non-backwashing) or backwashing, Clack or Fleck valve.
A tank with a gravel bed under the media
Yes. Keep the gravel in the bottom, around the center tube; the calcite goes on top. Our tanks are Vortech tanks and take no gravel.
pH 5.5 or higher in a 2.0 or 2.5 cu ft tank; 6.0 or higher in a 1.0 or 1.5
Plain calcite is enough.
pH below that
Calcite plus FloMag ($225), mixed box by box. See the comparison below.
An iron filter, softener or carbon tank
No. Calcite only raises pH. It does not remove iron, sulfur or manganese, and it does not soften water.
The media is granular, coarser than sand and never a powder, so it stays in the tank: a backwash does not lift a wet bed of 200 to 300 lb. Not sure which tank you have? Text Aidan a photo of it at 443-277-2204.
What ships
✓One 50 lb box of granular calcite, about half a cubic foot of media.
✓A cardboard box, not a printed bag. Calcite used to ship in 50 lb bags, and older videos and reviews still say bags; it is the same 50 lb of calcite, packed to ship.
✓Free shipping to the lower 48 states and DC.
Not included
✕FloMag, for pH below 5.5 (below 6.0 in a 1.0 or 1.5 cu ft tank): sold separately ($225).
✕A funnel. For a tank with a 1-1/4 inch side fill port, the domehole funnel ($99); for the top opening with the valve off, the Filter Media Funnel ($35). Our neutralizers sold with calcite ship with a funnel.
Open the box the day it arrives. A 50 lb box can split in transit. If it is damaged or calcite has spilled, note it with the carrier, take photos, and tell us within 3 days of delivery.
When to add calcite
Once a year, in a dark room, hold a flashlight against the back of the tank. The shadow line is the top of the calcite.
When the bed is about half down, add calcite: about 1 box on a 1.0 or 1.5 cu ft tank, 1 to 2 boxes on a 2.0 or 2.5.
Fill to about 10 inches below the fill port. You add to the bed; you never dump it and start over.
The first pH readings after a fresh fill run high from fine dust, and the first water out can look milky. Give it a couple of weeks of normal use before you judge the pH.
The full step-by-step (water off, cap off, siphon, pour, reseal) is in How to Service Your Acid Neutralizer, and Aidan does a top-off in this video (1:24). Do not let the tank run empty: acidic water goes straight to the pipes again. Questions: call 800-460-5810 or text Aidan at 443-277-2204, 7 days a week, 8 AM to 5 PM Eastern.
What ships
One 50 lb box of granular calcite (about 1/2 cu ft)
One 50 lb box of granular calcite for any upflow or backwashing neutralizer. Most top-offs take 1 or 2 boxes.
Calcite is crushed, screened limestone, mostly calcium carbonate. Acidic water dissolves a little of it on every pass through the tank, and that raises the pH. Once the water reaches neutral it stops dissolving, so plain calcite brings water to about pH 7.0 to 7.5 and does not push it alkaline. Raising the pH cuts down the copper that acidic water dissolves from the pipes.
Each box holds 50 lb of granular calcite made by Pennsy Supply (Oldcastle); its Water Neutralizer fine calcite, made at the Thomasville, PA plant, is listed by NSF to NSF/ANSI/CAN 60. It goes into any calcite acid neutralizer tank, any brand, upflow or backwashing. Check the level once a year and add calcite when the bed is about half down.
✔One 50 lb Box, About 1/2 cu ft
✔Raises pH to About 7.0 to 7.5
✔Upflow or Backwashing Tanks
✔Free Shipping, Lower 48 and DC
Feature
Plain calcite
Calcite + FloMag
Your water's pH
5.5 and up (2.0 or 2.5 cu ft tank); 6.0 and up (1.0 or 1.5)
Below that
Water after the tank
About pH 7.0 to 7.5
Usually around pH 8 to 8.5
Can it push pH too high?
No: it stops dissolving at neutral
Yes: more FloMag is not better
FloMag per 50 lb box
None
2.5 cu ft tank: 2 to 3 lb at pH 5.0 to 5.5, 5 lb at pH 4.0 to 5.0. Other sizes: ask Aidan
What to order
Boxes of this calcite
This calcite plus FloMag ($225), mixed box by box in a bucket
Your water's pH
Plain calcite5.5 and up (2.0 or 2.5 cu ft tank); 6.0 and up (1.0 or 1.5)
Calcite + FloMagBelow that
Water after the tank
Plain calciteAbout pH 7.0 to 7.5
Calcite + FloMagUsually around pH 8 to 8.5
Can it push pH too high?
Plain calciteNo: it stops dissolving at neutral
Calcite + FloMagYes: more FloMag is not better
FloMag per 50 lb box
Plain calciteNone
Calcite + FloMag2.5 cu ft tank: 2 to 3 lb at pH 5.0 to 5.5, 5 lb at pH 4.0 to 5.0. Other sizes: ask Aidan
What to order
Plain calciteBoxes of this calcite
Calcite + FloMagThis calcite plus FloMag ($225), mixed box by box in a bucket
Help with a top-off or a fill
Call or text about how much to add, the FloMag mix, or high pH readings after a fresh fill. Help is by phone and text.
A box. Parcel orders ship as one 50 lb cardboard box of calcite, about half a cubic foot. Calcite used to ship in printed 50 lb bags, and our older videos and reviews still say bags; it is the same 50 lb of calcite, packed to ship.
To top off a tank that is about half down: about 1 box for a 1.0 or 1.5 cu ft tank, 1 to 2 boxes for a 2.0 or 2.5.
To fill an empty tank: 2 boxes (1.0 cu ft), 3 (1.5), 4 (2.0), 5 (2.5) or 7 (3.5). The 3‑box, 4‑box and 5‑box packs cost less per box.
Yes, in any calcite acid neutralizer tank, upflow or backwashing, any brand. The grains are coarser than sand, so they stay in the tank. If your tank has a gravel bed, keep the gravel in the bottom and put the calcite on top.
Not sure what you have? Text Aidan a photo of the tank at 443-277-2204.
Only if your pH is low. Plain calcite handles pH 5.5 and up in a 2.0 or 2.5 cu ft tank, and 6.0 and up in a 1.0 or 1.5. Below that, mix FloMag into the calcite box by box. On a 2.5 cu ft tank: 2 to 3 lb of FloMag per 50 lb box at pH 5.0 to 5.5, and 5 lb at pH 4.0 to 5.0. For a 1.0, 1.5 or 2.0 cu ft tank, or below pH 4.0, call or text and we set the mix for your water. Never use FloMag by itself.
Check the level once a year and add calcite when the bed is about half down. Typical times between top-offs are 6 to 12 months on a 1.0 cu ft tank, 18 to 24 on a 1.5, 24 to 30 on a 2.0 and 30 to 36 on a 2.5. Very acidic water and heavy use shorten it. Step by step: how to service your acid neutralizer.
A little. The calcium and magnesium that neutralize the acid are hardness minerals, and calcite typically adds about 3 to 6 grains per gallon. We recommend a softener only if the water after the neutralizer tests 7 grains or more.
It is natural limestone, mostly calcium carbonate. The maker, Pennsy Supply (Oldcastle), lists its Water Neutralizer fine calcite from the Thomasville, Pennsylvania plant with NSF to NSF/ANSI/CAN 60, the standard for chemicals used to treat drinking water.
Sometimes. Home centers usually do not stock neutralizer calcite, but a water treatment supply house may. In his calcite video Aidan puts a 50 lb bag at about $25 to $75 locally, and says shipping can take the price to $145 or more. Ask for granular neutralizer calcite, not a powder.
Yes, if the box is unopened, within 30 days of delivery. Call 800-460-5810 for approval before you send it back. A 25% restocking fee applies (waived on an exchange of equal or greater value), and you pay the return freight. Media is not covered by the performance guarantee on our treatment systems. Full terms: Refund Policy.
Customer Reviews
5.0Based on 48 Reviews
5 ★
100%
48
4 ★
0%
0
3 ★
0%
0
2 ★
0%
0
1 ★
0%
0
Customer Photos
100reviewers would recommend this productWrite a ReviewAsk a Question
Calcite Acid Neutraliz...$145.00
What Calcite Costs Over Time
A neutralizer only works while there is calcite in it.
Can you get it locally?
Sometimes, and for less. In his calcite video Aidan puts a 50 lb bag at about $25 to $75 locally, and says shipping can take the price to $145 or more. Home centers usually do not carry it; a water treatment supply house may. Ask for granular neutralizer calcite, not a powder.
Topping off vs letting the tank run empty
Letting the calcite run out
Nothing today
❌Lifespan: Over when the calcite is gone
❌Result: Acidic water can dissolve copper from the pipes again
❌Support: None
Acidic water returns
Best Long-Term Value
A top-off at half down
$145 a box
✅Lifespan: 1 to 2 boxes every 30 to 36 months on a typical 2.5 cu ft tank
✅Result: Water stays at about pH 7.0 to 7.5
✅Support: Lifetime USA Support
About $4 to $10 a month
An empty tank means acidic water returns, as Aidan puts it in his calcite video. Check the level once a year and add calcite when the bed is about half down. On a 2.5 cu ft tank, 1 to 2 boxes every 30 to 36 months works out to roughly $4 to $10 a month (our arithmetic); very acidic water and heavy use cost more.
What you get for $145
The calcite: 50 lb of granular calcite made by Pennsy Supply (Oldcastle); its Water Neutralizer fine calcite is listed by NSF to NSF/ANSI/CAN 60.
The grade: nearly all grains 0.85 to 2 mm, coarser than sand, so it stays in the tank.
Delivered: one 50 lb box, shipped free to the lower 48 states and DC.
Help: call 800-460-5810 or text Aidan at 443-277-2204, 7 days a week, 8 AM to 5 PM Eastern.
Contact Us
800-460-5810
We're here to help.
30-Day Returns on Unopened Media
Returns and help, in plain terms
The Policy: New, unopened items in their original packaging can be returned within 30 days of delivery, with our approval first. A 25% restocking fee applies (waived on an exchange of equal or greater value) and you pay the return freight; opened items cannot be returned. The performance guarantee on our treatment systems does not cover media. Full terms are in our Refund Policy.
Calcite is media, so our standard return terms apply. Read them before you order, and check your pH and tank size first so you order the right amount.
Open the Box the Day It Arrives
+
A 50 lb box can split in transit. If it arrives damaged or calcite has spilled, note it with the carrier, take photos, and tell us within 3 days of delivery so we can help.
How Returns Work
1
Arrived Damaged, Short or Wrong?
Tell us within 3 days of delivery if a box is damaged, missing or wrong. For shipping damage, you file the carrier claim and we help with it.
2
Need to Return It?
Call 800-460-5810 within 30 days of delivery for approval before you send anything back. Unopened boxes can be returned. A 25% restocking fee applies (waived on an exchange of equal or greater value), and you pay the return freight.
Not Sure How Much to Order?
Text Aidan your pH and tank size at 443-277-2204 before you order.
Before you order, check your pH and your tank size. A top-off is usually 1 or 2 boxes; an empty tank takes 2 to 7 depending on its size. Text me if you are not sure.
