One-time purchase:
$23.92 $0.15 per Ounce
FREE delivery Tuesday, May 14 on orders shipped by Amazon over $35
Ships from: Amazon.com
Sold by: Amazon.com
Get Fast, Free Shipping with Amazon Prime FREE Returns
FREE delivery Tuesday, May 14 on orders shipped by Amazon over $35
In Stock
$$23.92 () Includes selected options. Includes initial monthly payment and selected options. Details
Price
Subtotal
$$23.92
Subtotal
Initial payment breakdown
Shipping cost, delivery date, and order total (including tax) shown at checkout.
Ships from
Amazon.com
Ships from
Amazon.com
Sold by
Amazon.com
Sold by
Amazon.com
Returns
Eligible for Return, Refund or Replacement within 30 days of receipt
Eligible for Return, Refund or Replacement within 30 days of receipt
This item can be returned in its original condition for a full refund or replacement within 30 days of receipt.
Read full return policy
Returns
Eligible for Return, Refund or Replacement within 30 days of receipt
This item can be returned in its original condition for a full refund or replacement within 30 days of receipt.
Read full return policy
Payment
Secure transaction
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Payment
Secure transaction
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Save up to 5% on auto-deliveries.

Unlock 5% savings

Save 5% when you receive 5 or more products in one auto-delivery to one address.

Choose how often it's delivered

From once every 2 weeks to once every 6 months

Skip or cancel any time

We'll send you a reminder before each delivery.
Learn more
FREE delivery Tuesday, May 14 on orders shipped by Amazon over $35
In Stock
Deliver every:
×

Added to cart

$$23.92 () Includes selected options. Includes initial monthly payment and selected options. Details
Price
Subtotal
$$23.92
Subtotal
Initial payment breakdown
Shipping cost, delivery date, and order total (including tax) shown at checkout.
Ships from and sold by Amazon.com
Add an Accessory:
Robelle 1405M Chlorine Tabs Pool Sanitizer, 5-Pounds
$53.83
Added to Cart
Robelle 2205B pH Up for Pools, 5-Pounds
$16.14
Added to Cart
Robelle 2306B pH Down for Pools, 6-Pounds
$15.24
Added to Cart
Robelle 2604B Pool Stabilizer for Pools, 4-Pounds
$24.18
Added to Cart

Robelle 2256B Alkalinity Increaser for Swimming Pools, 10-Pounds

4.6 4.6 out of 5 stars 433 ratings
$23.92 $0.15 per Ounce
Get Fast, Free Shipping with Amazon Prime
FREE Returns
10-Pounds
{"desktop_buybox_group_1":[{"displayPrice":"$23.92","priceAmount":23.92,"currencySymbol":"$","integerValue":"23","decimalSeparator":".","fractionalValue":"92","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"38usXtp3lrVZ%2FZ%2FakSltPMlV%2BwXchcIDPIjySrFei7ResPlL974ANZ2GCwuiSJRkRsxoxG00w9xU2s0CES%2BeR10udigEa%2BclYBCuQRaeBG1IVkVWPG7PnmL9CEWSXKIrY2CwtQ5DA8n7QrpDA8dlXw%3D%3D","locale":"en-US","buyingOptionType":"NEW","aapiBuyingOptionIndex":0}, {"displayPrice":"$23.92","priceAmount":23.92,"currencySymbol":"$","integerValue":"23","decimalSeparator":".","fractionalValue":"92","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":null,"locale":"en-US","buyingOptionType":"SNS","aapiBuyingOptionIndex":1}]}

Purchase options and add-ons

Brand Robelle
Item Weight 10 Pounds
Item Form Granular
Product Benefits Alkalinity Increaser

About this item

  • Sodium bicarbonate for pools
  • Raises total alkalinity and helps keep pool water pH stable
  • Maintain total alkalinity in the range of 60 to 120
  • 11 ounces raises alkalinity 10 ppm per 5,000 gallons of water
  • Prevents equipment corrosion and plaster damage

Customer ratings by feature

Easy to use
4.2 4.2
Value for money
4.1 4.1
See all reviews
Add a debit or credit card to save time when you check out
Convenient and secure with 2 clicks. Add your card

Frequently bought together

Robelle 2256B Alkalinity Increaser for Swimming Pools, 10-Pounds
$23.92 ($0.15/Ounce)
Get it as soon as Tuesday, May 14
In Stock
Ships from and sold by Amazon.com.
+
Robelle 2210B pH Up for Pools, 10-Pounds
$26.81 ($0.17/Ounce)
Get it as soon as Monday, May 13
In Stock
Ships from and sold by Amazon.com.
+
Pool Mate 1-2607B Pool Stabilizer for Pools, 7-Pounds
$32.25 ($0.29/Ounce)
Get it as soon as Monday, May 13
In Stock
Ships from and sold by Amazon.com.
Total price:
To see our price, add these items to your cart.
Details
Added to Cart
Choose items to buy together.

From the brand

Previous page
  2. Balanced Pool Water Ensures Sanitizer Efficiency, Swimmer Comfort and clear and helthy pool water
  3. Robelle 2607B Stabilizer for Swimming Pools, 7 lb
    Robelle 2256B Total Alkalinity Increaser for Swimming Pools, 10 lb
    Robelle 2205B pH Increaser for Swimming Pools, 5 lb
    Robelle 2825 25 Pounds Pool Calcium Increaser, 25-Pounds (Bucket)

    Step 1: Balance

    Visit the Store

  4. Sanitize with Robelle Chlorine: Kills Bacteria, Inhibits algae growth, Purifies and Disinfects
  5. Robelle 1405M Chlorine Tabs Pool Sanitizer, 5-Pounds
    Robelle 1410M Chlorine Tabs Pool Sanitizer, 10-Pounds
    Robelle 1420M Chlorine Tabs Pool Sanitizer, 20-Pounds
    Robelle 1440M-K 5-in-1 3-Inch Multi-Purpose Swimming Pool Chlorine Tabs, 35-Pounds

    Step 2: Sanitize

    Visit the Store

  6. Rejuvenate your pool water once a week with Robelle Shock
  7. Robelle 1701-12 Oxidizing Shock and Swim Monopersulfate Non-Chlorine Pool Shock, 1-Pound, 12-Pack
    Robelle 1701-24 Non-Chlorine Swimming Pool Shock, 24-Pack
    Dry Tec 1-1901-12 Treatment Pool Shock, 12-Pack
    DryTec 1-1901-24 Calcium Hypochlorite Chlorine Shock Treatment for Swimming Pools, 1-Pound, 24-Pack

    Step 3: Shock

    Visit the Store

  8. Prevent growth and treat existing algae with Robelle Algaecide.
  9. Pool Mate 1-2150-02 50 Pool Algaecide, 2-Pack
    Pool Mate 1-2150-04 50 Pool Algaecide, 4-Pack
    Pool Mate 1-2190-02BX Black Pool Algaecide, 2-Pack
    Pool Mate 1-2190-04 Black Pool Algaecide, 4-Pack

    Step 4: Algae Control

    Visit the Store

  10. Further Maintenance: Clarifiers and Stain Removers
  11. Robelle 2420-02 Water Brightener and Clarifier for Swimming Pools, 1-Quart, 2-Pack
    Robelle 2420-04 Water Brightener and Clarifier for Swimming Pools, 1-Quart, 4-Pack
    Robelle 2550-02 Mineral Out Stain Remover for Swimming Pools, 1-Quart, 2-Pack
    Robelle 2550-04 Mineral Out Stain Remover for Swimming Pools, 1-Quart, 4-Pack

    Further Maintenance

    Visit the Store

Next page

Product guides and documents

User Guide (PDF)

Product information

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Feedback

Robelle

Robelle 2256B Alkalinity Increaser for Swimming Pools, 10-Pounds

Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.

Where did you see a lower price?
/
/
/
/
Please sign in to provide feedback.

Looking for specific info?

Product Description

This product raises the total alkalinity in swimming pool water. It boosts the effectiveness of your pool water disinfectant, as well as aids in the prevention of scale formation, metal corrosion and the etching of pool surfaces. It helps maintain your pool’s pH level and eliminates pH “bounce”. Easy to use and dissolves quickly. Test for total alkalinity with a reliable test kit. The desired range for total alkalinity is as follows: Fiberglass Pools 70-100 ppm, Marcite, Painted, Tile, or Exposed Aggregate Pools 80-120 ppm, Vinyl Pools 120-140 ppm. If the total alkalinity is less than this desired range, add this product directly to the pool water while the pump is in operation, in accordance with the included table.

Compare with similar items

This Item
Robelle 2256B Alkalinity Increaser for Swimming Pools, 10-Pounds
Robelle 2256B Alkalinity Increaser for Swimming Pools, 10-Pounds
Recommendations
HTH 67060 Swimming Pool Care Alkalinity Up, Raises Alkalinity, Swimming Pool Chemical Stabilizes pH Fluctuation, 5 Lbs
HTH 67060 Swimming Pool Care Alkalinity Up, Raises Alkalinity, Swimming Pool Chemical Stabilizes pH Fluctuation, 5 Lbs
dummy
Pool Day 10LB Alkalinity Increaser - Increase Total Alkalinity in All Pools and Spas - 100% Sodium Bicarbonate
Pool Day 10LB Alkalinity Increaser - Increase Total Alkalinity in All Pools and Spas - 100% Sodium Bicarbonate
dummy
Clorox® Pool&Spa™ Swimming Pool 2-in-1 Perfect Balance, Maintains Balanced pH and Alkalinity Levels, 8LB (Pack of 1)
Clorox Pool & Spa Clorox® Pool&Spa™ Swimming Pool 2-in-1 Perfect Balance, Maintains Balanced pH and Alkalinity Levels, 8LB (Pack of 1)
dummy
Robelle 2257B Alkalinity Increaser for Swimming Pools, 25-Pounds
Robelle 2257B Alkalinity Increaser for Swimming Pools, 25-Pounds
dummy
Robelle 2850B Calcium Hardness Increaser for Pools, 50-Pounds
Robelle 2850B Calcium Hardness Increaser for Pools, 50-Pounds
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Price$23.92-17% $14.07
List: $17.00		$19.99-10% $17.97
List: $19.99		$47.91$88.53
Delivery
Get it as soon as Tuesday, May 14
Get it as soon as Monday, May 13
Get it as soon as Monday, May 13
Get it as soon as Tuesday, May 14
Get it as soon as Monday, May 13
Get it as soon as Tuesday, May 14
Customer Ratings
4.64.6 out of 5 stars433
4.64.6 out of 5 stars151
4.64.6 out of 5 stars22
4.64.6 out of 5 stars13
4.64.6 out of 5 stars167
4.64.6 out of 5 stars1,301
Easy to use
4.2
4.7
—
4.6
4.5
4.4
Value for money
4.1
4.3
—
4.6
4.3
4.3
Sold By
Amazon.com
Amazon.com
Pool Day
Amazon.com
Amazon.com
Amazon.com
form
Granular
Granular
—
—
Granular
Granular
weight
10 pounds
5 pounds
10 pounds
—
25 pounds
50 pounds

Customer reviews

4.6 out of 5 stars
4.6 out of 5
433 global ratings

Customers say

Customers like the quality, performance, and ease of use of the pool spa water treatment. They mention that it works well, is easy to use, and that it raises the alk.

AI-generated from the text of customer reviews

7 customers mention7 positive0 negative

Customers are satisfied with the performance of the pool spa water treatment. They mention that it works well and raises the alk.

"Comes well packaged and works well in our spa. Easy to use and seal the package back shut. Good buy." Read more

"...I will be using this product from now on. Works great I use it for my hot tub." Read more

"Works well but the “eco friendly” bag rips VERY easily resulting in chemicals going everywhere, a ton of cleanup and a major storage issue once the..." Read more

"Very good product. Worked well. Would highly recommend." Read more

3 customers mention3 positive0 negative

Customers find the pool spa water treatment easy to use. They mention that it works well and is easy to seal the package back shut.

"Comes well packaged and works well in our spa. Easy to use and seal the package back shut. Good buy." Read more

"Pool, easy to use and value for the money" Read more

"Easy to use in the bag and works well" Read more

3 customers mention3 positive0 negative

Customers are satisfied with the quality of the pool spa water treatment. They mention that it works well and is a good buy.

"...Easy to use and seal the package back shut. Good buy." Read more

"good stuff" Read more

"Very good product. Worked well. Would highly recommend." Read more

Top reviews from the United States

Florida Customer
5.0 out of 5 stars Works great
Reviewed in the United States on March 18, 2024
Size: 10-PoundsVerified Purchase
Cheaper than purchasing the same item at the store and it was delivered to my house.
Helpful
 Report
Debbie V
5.0 out of 5 stars Does what it says
Reviewed in the United States on February 11, 2024
Size: 10-PoundsVerified Purchase
Works as expected
Helpful
 Report
ABZ
4.0 out of 5 stars NaHCO3
Reviewed in the United States on June 12, 2023
Size: 10-PoundsVerified Purchase
It’s what it is. Works if you use it as prescribed.
One person found this helpful
Helpful
 Report
Kug
5.0 out of 5 stars Works Well
Reviewed in the United States on August 27, 2019
Size: 10-PoundsVerified Purchase
Comes well packaged and works well in our spa. Easy to use and seal the package back shut. Good buy.
Helpful
 Report
Joleen
5.0 out of 5 stars Works fantastic for my hot tub.
Reviewed in the United States on April 21, 2020
Size: 10-PoundsVerified Purchase
I could not get my alkalinity level to go up. I purchase this product and it came right up. I will be using this product from now on. Works great I use it for my hot tub.
Helpful
 Report
Jfig
5.0 out of 5 stars Value fir the money
Reviewed in the United States on July 31, 2022
Size: 10-PoundsVerified Purchase
Pool, easy to use and value for the money
Helpful
 Report
Amazon Customer
4.0 out of 5 stars Chemicals work, bag is flimsy and tears easily.
Reviewed in the United States on July 17, 2020
Size: 10-PoundsVerified Purchase
Works well but the “eco friendly” bag rips VERY easily resulting in chemicals going everywhere, a ton of cleanup and a major storage issue once the bag is damaged. Purchased both the alkalinity and ph increases from this company and both bags ripped the first time the side of the bag brushed the plastic outdoor storage chest we have them in.

Will not buy again until the bag is updated.
2 people found this helpful
Helpful
 Report
Dumitru Balan
5.0 out of 5 stars good stuff
Reviewed in the United States on July 28, 2022
Size: 10-PoundsVerified Purchase
good stuff
Helpful
 Report