An alkalinity increaser is a gentle but powerful chemical used to raise total alkalinity in pool water, acting as a crucial buffer for your pH levels. By stabilizing your water chemistry, it prevents rapid pH fluctuations that can damage equipment or irritate swimmers. It is the foundation of a consistently balanced, crystal-clear pool.
When pool owners struggle with erratic water chemistry, they often focus entirely on adjusting their pH. However, if your Total Alkalinity is too low, trying to balance your pH is a completely hopeless battle. Understanding how and when to use an alkalinity increaser gives you total control over your backyard oasis and stops the frustrating cycle of daily chemical adjustments.
Why Your Pool Needs an Alkalinity Increaser
To grasp why this chemical is so important, you must understand the relationship between pH and Total Alkalinity.
Your pool pH measures how acidic or basic the water is. Your Total Alkalinity acts as a protective shield for that pH. When your alkalinity drops below the ideal range of 80 to 120 parts per million (ppm), your water loses its buffer. Without this shield, even a heavy rainstorm or a small dose of chlorine can cause your pH to crash to dangerously acidic levels or spike dangerously high.
This wild instability is called “pH bounce.” Adding an alkalinity increaser restores the protective buffer, locking your pH firmly into place. To learn more about this vital chemical relationship, read our complete guide on understanding the role of pH in swimming pool water treatment.
What is Alkalinity Increaser Made Of?
The active ingredient in almost every commercial pool alkalinity increaser is sodium bicarbonate. This is the exact same chemical compound as household baking soda.
Sodium bicarbonate is highly alkaline, but it dissolves easily and safely into pool water. It is specifically chosen for this task because it does an incredible job of raising Total Alkalinity without causing a massive, uncontrollable spike in your pH levels at the same time.
Signs Your Pool Has Low Total Alkalinity
You should never add pool chemicals blindly. You must always test your water first. If you are unsure of your testing schedule, check out our resource covering how often you should test your pool water.
If your test kit reveals an alkalinity level below 80 ppm, you need to add an increaser immediately. Failing to do so will result in corrosive water. Corrosive water aggressively eats away at pool plaster, dissolves the grout between your tiles, and destroys the copper heat exchangers inside your pool heater.
How to Safely Add Alkalinity Increaser
Applying this chemical is a very straightforward process. You simply need to follow a few basic rules to ensure it dissolves properly.
- Calculate the Dose: Read the manufacturer instructions on the packaging. You will need to know your total pool volume in gallons to calculate the exact amount of powder required.
- Dilute or Broadcast: While you can broadcast the powder broadly across the deep end of the pool, pre-dissolving it in a bucket of pool water prevents the powder from settling on the bottom and clouding the water.
- Circulate: Leave your pool pump running on a high setting for at least four to six hours. This ensures the chemical is thoroughly mixed into the water column.
- Retest: After the water has circulated, retest your alkalinity. If it is still too low, repeat the process.
Because adjusting your alkalinity can slightly influence your pH, you may need to tweak your acidity afterward. If you need a refresher on adjusting those levels, explore the ultimate pool chemistry guide.
Protect Your Balanced Water with DualPool
Once you have used your alkalinity increaser to lock in your chemistry, your sanitizers can finally operate at peak efficiency. However, perfectly balanced chemistry is only half the battle when it comes to visual clarity.
To achieve that stunning, high definition sparkle, you need a proactive solution to handle microscopic debris. The DualPool 2-in-1 Pool Clarifier is the perfect companion to a chemically balanced pool. By dropping DualPool into your skimmer basket, its self-dosing formula continuously groups together suspended solids, phosphates, and heavy metals. By physically extracting these dulling contaminants from your balanced water, DualPool ensures your pool remains brilliantly clear with incredibly minimal effort.
Frequently Asked Questions (FAQ)
What is the difference between an alkalinity increaser and pH up? Alkalinity increaser is made of sodium bicarbonate, which is designed to drastically raise Total Alkalinity while only causing a very minor increase in pH. A “pH Up” product is typically made of sodium carbonate (soda ash), which is designed to drastically spike the pH level while having a much smaller impact on Total Alkalinity.
Can I use regular baking soda instead of pool alkalinity increaser? Yes. Household baking soda is sodium bicarbonate, which is the exact same active ingredient found in commercial pool alkalinity increasers. However, buying it in bulk from a pool supply store is usually much more cost effective than buying dozens of small boxes from a grocery store.
How long after adding alkalinity increaser can you swim? Because sodium bicarbonate is a very safe and gentle chemical, you generally only need to wait 20 to 30 minutes before swimming. This brief waiting period allows the powder to fully dissolve and circulate so you are not swimming through a concentrated cloud of the product. Always verify this waiting period by reading the specific instructions on your product packaging.