Soda ash, the common name for sodium carbonate, is one of the cheapest and most versatile chemicals you can keep on a shelf. It raises swimming pool pH, fixes fabric dye into cotton, softens hard water in the laundry, and helps make glass. Knowing where to buy soda ash for each of those jobs saves real money, because a pool-store tub and a grocery-aisle box are often the same compound sold at wildly different prices. This guide covers what to look for, what to avoid, how much to pay, and every retailer that stocks it, from Leslie’s Pool Supplies to Amazon.
This page contains affiliate links. We may earn a commission at no extra cost to you.
What Soda Ash Is and Who Needs It
Soda ash is sodium carbonate (Na2CO3), a white, odorless, strongly alkaline powder used to raise pH, set fabric color, boost detergent, and manufacture glass. Dissolved in water it reads about pH 11, so it moves water chemistry fast. Most of what sells in the United States starts as trona ore mined near Green River, Wyoming, though it can also be made industrially through the Solvay process.
Who actually needs it? Pool owners raising a low pH reading, tie-dye and batik artists fixing color into cellulose fibers, soap and candle makers, people softening hard water that is loaded with calcium and magnesium, and glass or pottery hobbyists. The dosing is simple. About 6 ounces per 10,000 gallons lifts pool pH by roughly 0.2 points, and a standard tie-dye soak is 1 cup per gallon of warm water. One warning up front: soda ash is not baking soda, which is sodium bicarbonate (NaHCO3) at a much gentler pH near 8.3, and swapping one for the other in a pool, dye bath, or soap recipe simply will not work.
What to Look For: Features and Buying Criteria
The right buy comes down to four things: grade, purity, quantity, and packaging. Get those right and the label on the front barely matters, because the chemistry inside the box is identical across most brands.
Grade. Pool-grade, laundry-grade, and technical-grade are all the same compound and interchangeable for pools, cleaning, and dyeing. Food-grade and USP-grade cost more and are only worth it for anything you will eat or put on skin.
Purity. A trustworthy product lists only pure sodium carbonate at 100 percent. Products branded “pH Up” or “Alkalinity Plus” sometimes blend the carbonate with sodium bicarbonate, which is fine for a pool but weaker for tie-dye and soap where the pure compound performs better.
Quantity. Match the size to a season of use. A 55-ounce box handles most households, a 5-pound pouch covers a pool season, and a 25 lb or 50 lb bag is for soap businesses, candle makers, and heavy dyers.
Packaging. The powder pulls moisture from humid air and cakes into hard bricks if left open. A resealable pouch or a sealed inner bag beats a plain cardboard carton, especially in the Southeast. You may also see “soda ash lite,” a lighter, fluffier form that dissolves a touch faster than dense soda crystals but weighs less per scoop.
| Grade | Typical use | Where it sells |
|---|---|---|
| Pool-grade | Raising pool pH | Pool stores, Home Depot, Lowe’s |
| Laundry-grade | Wash boosting, cleaning | Grocery, Walmart, Target |
| Technical-grade | Tie-dye, soap, glass | Dharma Trading, industrial suppliers |
| Food-grade | Consumables, some soap | Essential Depot, specialty sellers |
What to Avoid When Buying Soda Ash
The single most expensive mistake is grabbing the wrong box off the shelf. Read the label before you pay, and skip these traps.
Confusing it with baking soda. Sodium bicarbonate sits near pH 8.3 and barely nudges pH, while the carbonate near pH 11 moves it hard. In a pool or dye bath, the bicarbonate just wastes your time and money.
Overpaying at the pool counter. A branded “pH Up” jug is frequently the same compound as a grocery washing soda box at three or four times the price. Buy pool-grade only when you want the printed dosing chart.
Buying a blend for craft work. If a tie-dye or soap label mixes in bicarbonate, your colors will bond less reliably. Fiber artists want the pure carbonate, not a pool blend.
Ignoring humidity. An unsealed carton left in a garage turns into a solid lump within weeks. This matters because you cannot measure a dose from a brick. Related alkaline cleaners like borax keep better but are not a substitute in pool or dye jobs.
Where to Buy Soda Ash In Store
Brick-and-mortar stock splits by use: pool aisles in summer, the laundry aisle year-round, and craft shops for dye fixer. Here is who carries what.
Pool Supply Retailers
Leslie’s Pool Supplies is the most reliable in-person source, selling it as “Leslie’s Alka Plus” and “Leslie’s pH Plus” in 5, 10, and 25-pound tubs, and the staff will match a size to your pool volume. Pinch A Penny, common across the Southeast and Texas, carries house-brand and name-brand options. In The Swim and Pool Supplies Superstore stock the same buckets when you would rather pick up locally than wait on mail order.
Hardware and Big-Box Stores
The Home Depot and Lowe’s both shelve it in the pool and spa chemicals aisle during swim season under HTH, Clorox Pool&Spa, or a store label. Northern stores thin out in winter, so order online if the shelf is bare. Ace Hardware and True Value often keep it year-round for cleaning customers, and Walmart stocks the Arm & Hammer box in the laundry aisle at nearly every location.
Grocery and Drugstore Chains
Big supermarkets carry the 55-ounce laundry box in the detergent section: Kroger, Safeway, Publix, and Whole Foods all stock it, and Target sells it in store and online. Costco and Sam’s Club occasionally feature large boxes during pool season. Need a single box tonight? The grocery aisle is the fastest option.
Craft and Dye Specialists
Dharma Trading Company is the gold standard for tie-dye and batik supplies, selling its fixer in 1, 5, and 50-pound sizes next to Procion MX dyes. Sally Beauty stocks Rit dye fixative kits, Jacquard distributes a branded dye activator through JOANN, Michaels, and Blick Art Materials, and Hobby Lobby sometimes bundles a small fixer packet inside its tie-dye kits.
Where to Buy Soda Ash Online
Online is where selection and price both open up, and it is the only practical route for bulk. Amazon covers nearly every grade in a single search.
- Amazon. The widest range by far, with pool, laundry, craft, and soap grades side by side. Prime orders typically land in two days, and the return window makes it low risk to try a brand.
- Walmart.com and Target.com. Both list larger bags through marketplace sellers that never reach the physical shelf, with free shipping over the usual thresholds.
- Dharma Trading (dharmatrading.com). Direct source for high-purity dye fixer in 1, 5, and 50-pound sizes, shipped fast to fiber artists.
- Chewy. Stocks aquarium-safe grade for reef and cichlid keepers who buffer tank water.
- Uline, Grainger, and Duda Diesel. Industrial suppliers that ship food-grade and technical-grade in 50-pound bags and pallets to businesses and serious hobbyists.
How Much Should You Pay for Soda Ash
As of July 2026, the pricing splits cleanly into three tiers, and the gap between them is mostly packaging and branding, not chemistry.
- Budget: a grocery or Walmart 55-ounce Arm & Hammer box runs about $5 to $8. Best value per ounce for laundry and small craft jobs.
- Mid-range: a 5-pound pool pouch such as HTH pH Up runs about $12 to $20, and a 1-pound Dharma fixer runs about $6 to $10.
- Bulk and premium: a 50-pound bag lands around $40 to $70, and a food-grade 2-pound tub runs about $12 to $18.
When is paying more a waste? For plain laundry and household cleaning, the pool-store premium buys you nothing. A $6 grocery box is the exact same compound as the $20 pool jug. Save the mid-range spend for when you genuinely want a resealable pouch or a printed dosing chart. If your pool pH ever runs too high instead, you want an acid such as citric acid, not more of this.
Top Picks
These five soda ash picks prioritize purity, moisture-proof packaging, and retailers that ship quickly. Each is matched to a specific job so you buy the right size the first time.
- Best overall: Arm & Hammer Super Washing Soda, 55 oz. The household standard, pure carbonate, cheap, and stocked almost everywhere. Handles laundry, cleaning, small tie-dye, and soap. Around $5 to $8. Check price on Amazon.
- Best for pools: HTH pH Up, 5 lb pouch. Built for pool water and sold in a resealable pouch that resists clumping. One pouch covers several seasons of pH corrections. Around $12 to $20. Check price on Amazon.
- Best for tie-dye: Dharma Trading Soda Ash Fixer, 1 lb. The fiber artist favorite, a high-purity fixative that dissolves cleanly and pairs with Procion MX. Around $6 to $10. Check price on Amazon.
- Best bulk: Arm & Hammer Super Washing Soda, 50 lb bag. The right call for soap and candle makers, big pools, and anyone burning through a box a month. Around $40 to $70. Check price on Amazon.
- Best for soap making: Essential Depot Sodium Carbonate, 2 lb. Food-grade labeling and guaranteed purity, which matters when a trace impurity could discolor a cold-process batch. Around $12 to $18. Check price on Amazon.
Frequently Asked Questions
Is soda ash the same as baking soda?
No. Soda ash is sodium carbonate (Na2CO3) with a pH near 11, while baking soda is sodium bicarbonate (NaHCO3) with a pH near 8.3. They are different chemicals and are not interchangeable in pools, tie-dye, or most soap recipes.
What can I substitute for soda ash?
For most jobs, washing soda is not a substitute, it is the exact same sodium carbonate under a different name. Borax is more alkaline than bicarbonate but still weaker than the carbonate, so it will not reliably fix dye or raise pool pH. There is no cheaper drop-in replacement.
How much soda ash do I need for a 10,000-gallon pool?
About 6 ounces raises the pH of 10,000 gallons by roughly 0.2 points. Test first, add in small doses, pre-dissolve the powder in a bucket, and re-test after the pump and filter have circulated the water for at least an hour.
Is Arm & Hammer Super Washing Soda the same as sodium carbonate?
Yes. Arm & Hammer Super Washing Soda is 100 percent sodium carbonate. It is the grocery-aisle equivalent of the pool-store and craft-store versions and works for laundry, cleaning, and small dye projects.
Why does tie-dye need soda ash?
Fiber-reactive dyes bond with cotton and other cellulose fibers only in an alkaline environment. Soaking fabric raises the pH of the fiber so the dye forms a permanent covalent bond instead of rinsing out after the first wash.
Start by matching the grade to your job, then buy the smallest size that covers a season so it never cakes on the shelf. For laundry or a craft project, grab an Arm & Hammer box at any grocery store, Walmart, or Target. For pool pH, buy at Leslie’s, The Home Depot, or Lowe’s. For tie-dye, order a purpose-made fixer from Dharma Trading Company. Whatever the use, confirm the label reads 100 percent sodium carbonate, and the right soda ash for the job is easy to find.
Reviewed by the wheretobuyguides.com editorial team. Prices and retailer availability verified July 2026.