If you're staring at a testing strip and wondering how can i increase the ph in my pool because the colors just aren't lining up, you're definitely not alone. It's one of those classic pool owner headaches where you think you have everything balanced, and suddenly the water is getting a bit too acidic for comfort. Dealing with low pH isn't just about keeping the water clear; it's about making sure your eyes don't sting and your expensive pool equipment doesn't start corroding from the inside out.
Low pH basically means your water has become a bit too "hungry." It wants to eat away at things like your heater's copper heat exchanger or the grout in your tiles. If the pH drops below 7.2, you're in the danger zone. Ideally, you want to hover right around 7.4 to 7.6. It sounds like a narrow window, but once you get the hang of it, it's really not that hard to manage.
Using Soda Ash to Bump the Numbers
The fastest and most common way to fix the problem is by using sodium carbonate, which most people just call soda ash. It's a white powder that packs a punch when it comes to raising pH levels. Unlike other chemicals that might nudge the needle slightly, soda ash is the heavy hitter.
When you use soda ash, you're basically neutralizing the acidity in the water. Most pool stores sell it in buckets, but you can find it under various brand names. The main thing to remember is that it also raises your total alkalinity a bit, though its primary job is to target the pH.
Before you dump anything in, you need to know how much water you're dealing with. If you have a 10,000-gallon pool, you'll obviously need a lot less than the neighbor with a 30,000-gallon setup. A good rule of thumb is to start small. You can always add more, but it's a total pain to bring the pH back down if you overshot it and ended up with cloudy water.
Can You Use Baking Soda Instead?
I get this question all the time: "Can't I just use that big bag of baking soda from the pantry?" The short answer is yes, but there's a catch. Baking soda is sodium bicarbonate. While it will technically raise your pH, its main superpower is raising total alkalinity.
If your pH is low but your alkalinity is already in a good spot (around 80 to 120 ppm), using baking soda might push your alkalinity through the roof while only barely moving your pH. This can lead to "alkalinity bounce" and scaling. However, if both your pH and your alkalinity are bottoming out, baking soda is actually a fantastic choice because it tackles both problems at once. Just keep in mind you'll need a lot more of it compared to soda ash to see a significant change in the pH.
The Step-by-Step Process for Adding Chemicals
You don't want to just walk out to the deep end and toss a handful of powder into the wind. That's a great way to get a face full of chemicals and potentially bleach your liner or irritate the floor of the pool. Instead, follow a simple routine to make sure it mixes properly.
- Test your water first. Use a reliable drop test kit if you can. Strips are okay for a quick check, but the liquid drops are usually much more accurate when you're trying to do math for chemical additions.
- Calculate the dose. Check the back of the bag or use a pool calculator app. Usually, you're looking at something like 6 ounces of soda ash per 10,000 gallons to raise the pH by 0.2.
- Get a bucket of pool water. Fill a five-gallon bucket about halfway with water from the pool. Always add chemicals to water, never water to chemicals.
- Stir it up. Use a stick or something you don't mind getting dirty to dissolve the powder. It should look like a cloudy slurry.
- Walk the perimeter. Slowly pour the mixture around the edges of the pool while the pump is running. Avoid pouring it directly into the skimmer as the concentrated dose can be hard on your filtration system.
- Wait and re-test. Give the water at least six to eight hours to circulate. Honestly, waiting 24 hours is even better before you test again to see if you hit your target.
Why Does the pH Keep Dropping Anyway?
It's frustrating when you fix the pH only to find it back in the basement a week later. There are a few culprits that usually cause this. One of the biggest ones is actually the rain. Rainwater is naturally acidic, and a heavy summer thunderstorm can dump enough low-pH water into your pool to throw off the balance completely.
Another sneaky cause is the type of chlorine you use. If you're using those big 3-inch stabilized chlorine tablets (trichlor), they have a very low pH. As they dissolve to keep your pool sanitized, they're also slowly lowering the pH of the water. If you're a heavy user of tabs, you'll probably find yourself asking how can i increase the ph in my pool every single month.
Lastly, check your total alkalinity. I mentioned this earlier, but it's worth repeating. Total alkalinity acts as a "buffer" for your pH. If your alkalinity is too low, your pH will swing wildly up and down like a roller coaster. If you can't get your pH to stay stable, fix the alkalinity first, and the pH will usually follow suit.
The Free Method: Aeration
Believe it or not, you can actually raise your pH without adding a single chemical. It sounds like magic, but it's just basic chemistry. This method is called aeration.
When you agitate the water, it causes carbon dioxide (CO2) to escape into the air. Since CO2 is acidic when dissolved in water, getting rid of it naturally raises the pH level. The best part? Aeration doesn't affect your total alkalinity at all.
You can do this by turning on any water features you have, like fountains or waterfalls. If you don't have those, you can point your return jets upward so they break the surface and create lots of bubbles. Some people even DIY a temporary fountain using PVC pipe attached to a return jet. It takes a lot longer than adding soda ash—sometimes several days of constant bubbling—but it's a great way to fine-tune the levels without buying more supplies.
When Should You Use Aeration?
This is the perfect move if your pH is low but your total alkalinity is already high. Adding soda ash would make the alkalinity even higher, which you don't want. By running your fountains or a deck jet, you can pull that pH up while keeping your alkalinity exactly where it is.
Don't Overthink the Small Fluctuations
It's easy to get obsessive over the perfect shade of pink or orange on your test kit. But keep in mind that pool chemistry is dynamic. It changes when people swim, when the sun beats down on it, and even when you add fresh water from the hose.
If your pH is at 7.3, don't panic and start dumping pounds of soda ash into the water. You're still within a safe range. Only start making adjustments when you see it dipping toward 7.0 or 7.1. Most of the time, a small nudge is all it takes.
Safety First With Pool Chemicals
Whenever you're handling things like soda ash or even baking soda, just be smart about it. Wear some gloves, and try not to breathe in the dust when you're pouring it into the bucket. It's not as scary as muriatic acid, but it can still irritate your skin and lungs.
Also, make sure the pump is running whenever you add chemicals. You need that circulation to distribute the product evenly. If the water is stagnant, the chemical can settle on the bottom and potentially damage the surface of your pool, especially if you have a vinyl liner.
Anyway, keeping your pool's pH in check is just part of the routine. Once you realize it's a balance between soda ash for big moves, baking soda for alkalinity, and aeration for the "clean" fix, you'll feel way more confident. Just take it slow, test often, and you'll have that perfect, crystal-clear water all summer long.