The Minnesota State Fair of Pool Problems

August 27, 2026 | Your Happy Dolphin Pool & Spa Team

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The Minnesota State Fair judges pigs, pies, and giant pumpkins every August. We judge pools. Late summer brings the same handful of problems into our store, week after week, from every corner of the metro. So we picked five and gave each one a ribbon. Here are this year's winners.

1 Most Colorful Exhibit: Green Water

Warm water, long days, and heavy swim time break down chlorine fast in August. Algae spores are already in the water and the air around your pool. They just need a chance. Skip a day or two of testing, host a big pool party, or get a heavy rain that dilutes your chlorine, and that chance shows up fast. A pool can go from clear to green over a single hot weekend. Green water is the top call we get this time of year, and it's an easy fix once you catch it. Wait too long and a light green tint can turn into a darker, thicker bloom that takes more product and more time to clear.

2 Best Special Effect: Cloudy Water

Cloudy water isn't one problem. It can be pH out of range, a filter that needs a clean, fine dust from a dry August, or all three at once. When pH drifts too high or too low, chlorine can't do its job well, and small particles start to build up instead of getting killed off. A filter that's overdue for a clean lets those same particles pass right back through instead of catching them. Dry spells add fine dirt and pollen that are almost too small to see, but they cloud the water all the same. A home test strip can point you in a rough direction, but it won't catch everything, including phosphates and metals that feed the problem behind the scenes. Guessing wastes chemicals and time.

3 Longest Running Grudge Match: Rust and Iron Stains

Minnesota well water carries a lot of iron, and some city supplies carry a fair amount too. When that water fills a pool, the metal stays dissolved and invisible at first. Then a change in pH or a shock treatment pulls it out of the water and drops it onto the plaster, usually near return jets, steps, or the skimmer, anywhere water moves slowest. A stain that shows up in July is still there in August if nobody treats it. Left alone long enough, a stain can work its way into the surface and get harder to lift out. These stains don't fade on their own, no matter how much you shock the water. In fact, shocking a stained pool without treating the metal first can make the stain darker instead of better.

4 Loudest Complaint at the Judges' Table: Strong Chlorine Smell

Every August we hear the same line: "I put in more chlorine and it still smells." That smell isn't too much chlorine. It's chloramines, chlorine that has already latched onto sweat, sunscreen, and body oil and used itself up doing the job. By late summer, pools that see a lot of swimmers, day camps, or birthday parties build up chloramines faster than the chlorine level alone can show you. The stronger the smell and the more your eyes sting, the more chloramines are actually in the water, not less. Adding more regular chlorine doesn't fix it, because that new chlorine just grabs onto more waste and forms more chloramines. The pool needs a big enough dose all at once to break that bond apart and burn the chloramines off for good. That's what shocking does.

5 Sneakiest Contestant: Calcium Scale

Calcium scale doesn't show up overnight. It builds a little at a time, and August gives it plenty of help. Hot weather means heavy evaporation, and every time you top off the pool with tap water, you're adding more calcium along with it. Do that all summer and the level creeps up without anyone noticing. The first sign is usually a rough, chalky feel along the waterline tile, sometimes with a white or gray crust you can scratch off with a fingernail. In bad cases, the water itself can take on a faint cloudy look even when the chemistry otherwise checks out. Hot tub owners tend to see this even sooner, since higher water temperatures push calcium out of the water and onto surfaces faster. Left alone, scale gets harder to remove the longer it sits, and inside a heater it builds up like buildup inside a kettle, making the heater work harder and wear out sooner.

This Year's Judges' Scorecard

Not sure which category your pool falls into? Bring in a sample. We'll test it, tell you what's going on in plain language, and send you home with exactly what you need. No blue ribbon required.

Whatever ribbon your pool would win this month, our team can help you fix it fast. Stop by with a water sample or give us a call. We make pool ownership a joy!

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