If you woke up this morning, Saturday, July 18, and looked out at your backyard in Mesa, Gilbert, or Chandler, you probably saw a bit of a mess. Last week’s monsoon wasn’t just a "dust and wind" show: it brought some serious moisture. Downtown Mesa clocked in at a heavy 1.26 inches of rain. While the sky is clearer today and we’re back to our standard 100°F Arizona heat, your pool is likely still "feeling" the storm.
Rainwater itself isn't usually the problem; it’s what that rain brings with it. In the East Valley, rain is a delivery vehicle for dust, nitrogen, phosphates, and organic debris from our desert landscape. If your water looks a little dull or your chlorine has vanished, you aren't alone. This is the peak of east valley pool problems 2026, and getting your chemistry back in line today is the difference between a crystal-clear Sunday swim and an expensive green algae bloom by Monday.
Here is my 21-year veteran guide to rebalancing your pool after an Arizona monsoon.
Step 1: Clear the Debris (Before the Chemicals)
Before you even touch your test kit, you have to get the "gunk" out. Rain and wind wash mesquite leaves, palo verde pods, and fine desert silt into the water. If left there, these organics break down and skyrocket your phosphate levels, which acts as a buffet for algae.
- Empty the Baskets: Check your skimmer and pump baskets immediately. If they are packed tight with leaves, your pump is struggling to move water, which means your chemicals won't mix.
- Deploy the Cleaner: If you have a Pentair Rebel pool cleaner, make sure the turbine isn't jammed with small sticks or pods. The Rebel is a workhorse for post-storm silt, but it needs a clear throat to do its job.
- Net the Surface: Get the floating stuff out before it sinks and stains your plaster.
Step 2: Test, Don't Guess
In arizona pool maintenance, guessing is the fastest way to waste money at the pool store. After 1.26 inches of rain, your water chemistry is likely diluted and shifted.
I always recommend a high-quality kit like the Taylor K-2006 test kit. Unlike test strips, which can be difficult to read in the bright Arizona sun, the Taylor kit uses a titration method (drops) that gives you professional-grade accuracy.
What to Look For Today:
- Free Chlorine (FC): Likely near zero. The "organics" brought in by the rain have likely "eaten" all your active sanitizer.
- pH: Usually rises after a storm due to the aeration of the water (all those raindrops hitting the surface).
- Total Alkalinity (TA): Can drop slightly depending on the acidity of the rain, but usually stays fairly stable unless the rain was massive.
Step 3: The "Golden Order" of Rebalancing
When you start adding pool chemistry solutions, the order matters. If you try to fix your chlorine before your pH is right, the chlorine won't work effectively.
- Total Alkalinity (TA) First: Target 80–120 ppm. Alkalinity is the "buffer" for your pH. If this is off, your pH will bounce around like a rubber ball. Use sodium bicarbonate to raise it if it’s low.
- pH Second: Target 7.4–7.6. In the East Valley, our water is naturally "hard" and tends to lean alkaline. If your pH is over 7.8, add muriatic acid. Chlorine is significantly less effective at a high pH, so don't skip this step.
- Test first. Choose any treatment from current measurements, a credible pool volume and the actual sanitizer label; a forecast, calendar or upcoming party does not determine a safe dose. Follow label reentry instructions and retest before allowing swimming. A fixed chlorine target does not guarantee removal of every contaminant. CDC testing guidance. CDC chemical safety.
Step 4: Deal with the Silent Killer: Phosphates
One of the most common Mesa pool cleaning challenges after a monsoon is the sudden spike in phosphates. Dust from our haboobs is loaded with them. Even if your chlorine levels are perfect, high phosphates can allow algae to grow "under the radar."
If you’ve balanced your water but it still looks "hazy" or "flat," test for phosphates. Using a phosphate remover can "starve" any potential algae before it starts. This is a staple of professional Gilbert pool maintenance during the summer months.
Step 5: Check Your Automation and Equipment
If you have pool automation tools like the Pentair IntelliCenter, check your dashboard. A heavy storm can occasionally trip a breaker or cause a sensor to give a false reading if debris is stuck in a flow switch.
Set pump speed and schedule from the actual pool and equipment requirements. Confirm adequate flow for filtration, sanitizer, heater and cleaner before lowering speed. No universal air-temperature formula or number of operating hours proves sanitation. Inspect flow, filter condition and water-test results, and use the exact model instructions or qualified assistance. Pentair servicing guidance.
Expert Help is Only a Photo Away
I know that looking at a swampy pool after a storm can be overwhelming, especially if you’re trying to DIY your Queen Creek pools or San Tan Valley backyard. Sometimes the water just doesn't respond the way the manual says it should.
That’s why we offer our Virtual Service Call. Instead of paying for a full-price service call just for a "second opinion," you can upload photos and videos of your equipment and water. I’ll personally take a look, give you a real diagnosis, and tell you exactly what chemicals you need (or if there’s a mechanical issue with your pump). It’s the fastest way to get chandler pool service expertise without the wait.
Stay cool, keep that pump running, and let's get those pools back to blue!
: Jeff Niegsch, Founder, Complete Aquatic Solutions