Rx Clear Calcium Hardness Increaser for Swimming Pools, 4 lbs
Rx Clear Calcium Hardness Increaser for Swimming Pools, 4 lbs
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Rx Clear Calcium Hardness Increaser for Swimming Pools, 4 lbs

4.7 stars out of 66 reviews
(4.7)|
66 ratings
Rx Clear Calcium Hardness Increaser for Swimming Pools, 4 lbsRx Clear Calcium Hardness Increaser for Swimming Pools 4 lbsRx Clear Calcium Hardness Increaser for Swimming Pools 8 lbsRx Clear Calcium Hardness Increaser for Swimming Pools 25 lbs
Size:4 lbs
selected, 4 lbs, $15.99
8 lbs, $26.92
25 lbs, $52.92

Key item features

  • Rx Clear Calcium Hardness Increaser for Swimming Pools, 4 lbs
  • Increases calcium hardness
  • Prevents stains or deterioration
Current price is $15.99
Price when purchased online
  • Free shipping

How do you want your item?

How do you want your item?
Columbus, 43215
Arrives by Mon, Apr 20
|
Sold and shipped by Four Seasons Pool SupplyPro Seller
4.214402618657938 stars out of 5, based on 1833 seller reviews(4.2)
Report an issue with this seller
30-day returns with seller only
Item not eligible for in-store returns

About this item

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Customer ratings & reviews

4.7 out of 5 stars
stars66 ratings46 reviews
How item rating is calculated
  1. 5 stars79% (52)
  2. 4 stars15% (10)
  3. 3 stars2% (1)
  4. 2 stars3% (2)
  5. 1 star2% (1)
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Showing 1-3 of 46 reviews

Jul 23, 2024
Jeremy Will
5 out of 5 stars review

Seller Verified Purchase

I chose to buy from this website because it was cheaper than 2 other major companies. I'm not sure if this is the reason but the chemicals come in a plastic bag in the cardboard box. I think this is a fantastic idea; I have a lot of buckets from chemicals that become plastic waste so not having it in a bucket is great. Otherwise, the chemicals are the same as from any other company as far as I can tell.

Review from poolsupplies.com
Helpful?27RTM9C2GW5D146928445
Jun 11, 2025
Bruce A Huebner
5 out of 5 stars review

Seller Verified Purchase

Great product and easy to use.

Review from poolsupplies.com
Helpful?27RTM9C2GW5D146928445
Jun 25, 2021
gayle
5 out of 5 stars review

Verified Purchase

This is excellent for removing excess moisture in your home…We live in an old farm house that had a musty smell ….I saw a video on how the Amish ppl use this … It really works….put some of this in a cloth bag ….. hang it over a container BC it will drip ,drip ,drip, removing moisture from the air…. NO MORE MUSTY SMELL !!!!! YEA!!!!!

Helpful?27RTM9C2GW5D146928445