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SpaPure Alkalinity Increaser | Spa pH Buffer

By SpaPure
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Description

SpaPure Alkalinity Increaser is a simple, effective balancer that raises the total alkalinity of your spa water. It's pure sodium bicarbonate — the same trusted chemistry behind reliable water balance — and it goes to work immediately, with no waiting period before you soak.

Total alkalinity is the unsung hero of spa water. It acts as a buffer that holds your pH steady, so the water resists the wild swings ("pH bounce") that happen when alkalinity runs low. When alkalinity drops too far, the consequences add up fast: corrosion of your spa and equipment, a sanitizer that can't do its job efficiently, and water that stings eyes and irritates skin.

Get alkalinity into range and the whole system settles down — pH becomes easy to manage, your sanitizer works as intended, and the water is gentler on both your spa and your skin.

Pro Tip: Balance alkalinity before pH, not after. Total alkalinity is the foundation that keeps pH stable, so trying to dial in pH while alkalinity is off is a losing battle — the pH won't hold. Set your total alkalinity into the 80–120 ppm range first, and you'll find pH falls into place and stays there.

Brand

SpaPure®

What's in the Box
  • 1 x SpaPure Alkalinity Increaser (resealable container, granular — available in 1 lb or 2 lb, depending on the size you select)
Key Features
  • Raises total alkalinity — brings low alkalinity back into the proper range
  • Stabilizes pH — acts as a buffer to prevent pH bounce
  • Protects your spa — proper alkalinity guards against corrosion and scale
  • Helps your sanitizer work — balanced water lets chlorine or bromine perform efficiently
  • Pure sodium bicarbonate — straightforward, dependable chemistry
  • No wait to soak — the spa may be used immediately after application
  • Two sizes — 1 lb for occasional adjustments, 2 lb for frequent fills or better value
How It Works

When you add sodium bicarbonate to spa water, it raises the total alkalinity — the water's capacity to neutralize acids. That buffering capacity is what keeps pH from swinging every time you add a chemical or a few bathers get in. Higher, balanced alkalinity means your pH stays put, which in turn keeps your sanitizer effective and your water comfortable.

The dosing is predictable: roughly 1/2 ounce (1 tablespoon) per 200 gallons raises total alkalinity about 10 ppm. That makes it easy to calculate exactly how much you need to reach your target instead of guessing.

Pro Tip: Alkalinity doesn't drift the way pH does, so you only need to test it about half as often as pH. Once you've set total alkalinity into range, it tends to stay there between water changes — check it during your fill and then just periodically, and spend your routine attention on pH and sanitizer instead.

Directions for Use

Use whenever total alkalinity tests below the proper range. Aim for a total alkalinity of 80–120 ppm.

  1. Turn on the circulation system.
  2. Add 1/2 ounce (1 tablespoon) per 200 gallons of water to raise total alkalinity about 10 ppm, broadcasting the product over the surface of the water.
  3. The spa may be used immediately after application.
  4. Wait about one hour, then retest total alkalinity and repeat as needed until it sits in the 80–120 ppm range.

Pro Tip: Add it in steps, not all at once. Calculate the dose for your spa's gallons, add it, let it circulate, and retest before adding more. Working up to your target gradually keeps you from overshooting — and overshooting alkalinity means reaching for a pH/alkalinity decreaser to walk it back.

Specifications
  • Brand: SpaPure
  • Product Type: Total alkalinity increaser / pH buffer (balancer)
  • Form: Granular
  • Active Ingredient: Sodium bicarbonate (100%)
  • Dosage: 1/2 oz (1 tbsp) per 200 gallons raises total alkalinity ~10 ppm
  • Available Sizes: 1 lb and 2 lb
  • Coverage: 1 lb provides roughly 30+ alkalinity adjustments for a typical spa; the 2 lb provides about double (actual amount depends on how far off your alkalinity is)
  • Target Level: 80–120 ppm total alkalinity
  • Ready to Use: Immediately after application
  • System: Compatible with all sanitizer systems (chlorine, bromine, salt, mineral)
Compatibility

SpaPure Alkalinity Increaser works in any spa, on any sanitizer system — chlorine, bromine, salt, or mineral. As a balancer, it's part of the foundation you set before your sanitizer goes to work, so it fits every water care routine.

It pairs naturally with the rest of your balancing lineup: a pH decreaser for when pH climbs too high, SpaPure test strips to read your alkalinity and pH, and your sanitizer and shock — which should always be added after the water is balanced. Think of this as step one, before chlorinating granules, brominating tabs, or oxidizing shock.

Warranty Policy

Most products purchased from our online shop within the last 30 days are eligible for return. Please review our return policy to see the list of items that cannot be returned.

Some major items that are non-returnable:

  • Gift cards
  • Electronics
  • Pumps / Motors
  • Hot Tubs
  • Closeouts
  • Fireplaces
  • Electric Fireplaces
  • Massage Chairs
  • See return policy below for full list of non-returnables.

SpaPure® Brand FAQs

What is SpaPure, and who makes it?

SpaPure is a line of spa and hot tub water care products from Haviland Pool & Spa, a 100% employee-owned American manufacturer with more than 55 years of pool and spa experience. Haviland's Pool & Spa division began in 1968 in Grand Rapids, Michigan, and all SpaPure products are made in the USA.

Is SpaPure formulated specifically for spas, or is it pool chemicals in smaller bottles?

SpaPure is engineered specifically for spas and hot tubs. Spa water is a different challenge from pool water — far less volume, a much higher bather load per gallon, and hotter temperatures that accelerate everything. SpaPure's formulas are concentrated and dosed for that environment rather than scaled-down pool products.

Can I use SpaPure products with my chlorine, bromine, or salt water system?

Yes. SpaPure makes products for chlorine, bromine, and salt/mineral programs, plus balancers, shocks, clarifiers, and specialty treatments that work alongside any of them. Match the sanitizer-specific products to your system, and use the balancers and oxidizers regardless of which sanitizer you run. If you're not sure what fits your setup, a quick water test will point you to the right products.

Why buy SpaPure from an authorized dealer like Leisure Time Inc.?

Buying from an authorized dealer means you get fresh, correctly stored product — spa chemicals degrade with age and poor storage — backed by people who can actually help you use it. Leisure Time Inc. has carried spa water care for decades, and our team can match products to your specific spa and water chemistry. Chemicals sold far below market price on third-party marketplaces are often expired, mishandled, or gray-market, with no support behind them.

Why do some SpaPure products ship ground only and can't be returned by mail?

Certain spa chemicals — chlorine and bromine products, oxidizers, and some acids — are classified as hazardous materials by the U.S. Department of Transportation. Federal regulations require them to ship by ground rather than air and prohibit consumers from mailing them back. Products with this restriction are noted on the product page. If you have unopened chemicals you no longer need, you can return them in person at one of our showrooms or contact us about your options.

How do I know which SpaPure products my spa needs?

Start with a water test. Testing tells you what your water actually needs instead of guessing — which sanitizer level to adjust, whether to balance pH or alkalinity, and when to shock. You can test at home with SpaPure test strips, or bring a water sample to any Leisure Time showroom for free in-store testing and a product recommendation. You can also call us and we'll walk you through it.

About SpaPure®

SpaPure is a spa-specific water care brand made by Haviland Pool & Spa, a 100% employee-owned American company with more than 55 years in pool and spa chemistry. Haviland's Pool & Spa division began in 1968 in Grand Rapids, Michigan, as one of the early pioneers of modern pool and spa treatments, and today produces over 100 products across eight in-house brands. Because Haviland is employee-owned through an ESOP, the people who make and stand behind SpaPure have a direct stake in whether your water turns out right.

SpaPure is built specifically for spas and hot tubs — concentrated, fast-acting formulas designed for the small water volumes and high bather loads that make spa water harder to keep balanced than pool water. The line covers the full routine: sanitizing, shock and oxidation, water balance, clarifiers and enzymes, stain and scale control, and salt-system support — all proudly made in the USA.