When your pool’s water temperature climbs into the mid-70s, swim season isn’t just approaching. It’s here. For Houston-area pool owners, later February and March mark the shift from casual maintenance to active preparation. Your equipment needs a check, and your water chemistry needs adjustment. That yellow-green film coating your pool? It’s probably pollen, not algae.
The difference between a pool that’s ready when you want to dive in and one that makes you wait weeks for treatment comes down to timing and preparation.
When to start preparing for swim season in Houston
Temperature triggers action
Most Houston pools run year-round, but running and being swim-ready are different things. When water temperature hits the mid-70s—typically in March—it’s time to give your pool a closer look. Warmer water speeds up everything: how fast you go through chemicals, how quickly algae can develop, and how hard your equipment works. What kept things balanced during cooler months won’t cut it once swim season arrives.
Pollen season complicates everything
Houston’s pollen season hits right when water temperatures start climbing. That green tint might not be algae. Oak and pine pollen coat pools in a yellow-green layer that can look concerning but needs different treatment than an actual algae bloom in pool systems. Pollen also clogs filters much faster than normal debris. So your usual cleaning schedule probably won’t be enough during peak months.
Essential equipment checks before swim season
Filter cleaning takes priority
Your filter works harder during swim season than at any other time. Most filter cartridges get cleaned every 3 or 9 months. But pollen levels can completely throw that schedule off. A clogged filter doesn’t just make water cloudy. It can crack cartridge elements, crush grids, and damage the manifolds inside your filter housing.
Get your filter cleaned before swim season hits. If you’ve been on a 9-month schedule through winter, consider switching to more frequent cleanings once spring arrives. Putting off pool filter repair and maintenance means replacing parts instead of cleaning them.
Pool pump and motor inspection
Pool pumps are the second most common equipment failure when you ramp up for swim season. After running at lower speeds or shorter hours through winter, pump seals can start leaking, and motor bearings can wear out. Small issues suddenly become big problems.
Watch for these warning signs with your pool pump:
- Water pooling around the pump
- Grinding or whining sounds you haven’t heard before
- Weaker flow from your return jets
- Drips or leaks around where the motor shaft enters the pump
When you start running your pump 8-12 hours a day instead of 4-6, any pump that’s already struggling will probably quit. Better to catch it in March than have it fail in June when everyone wants to swim.
Other equipment to check
Give these a look before swim season kicks in:
- Your pool cleaner and its booster pump (if you have one)
- Automation controls and timers
- Pool lights—make sure there’s no water inside them
- All fixtures are tight and secure
One piece of equipment failing often creates problems with everything else once you’re using the pool daily.
Adjusting water chemistry for swimming season
Warmer water goes through pool chemicals much faster. A complete chemistry check looks at free chlorine, pH, total alkalinity, calcium hardness, cyanuric acid, and salt levels if you have a saltwater system. These numbers affect each other, which is why the adjustment order matters.
Home test kits give you the basics, but they have limits. Test reagents expire, and strips aren’t as precise as liquid tests. Most kits don’t check for phosphates, a hidden chemistry issue that explains why some pools need constant attention while others stay balanced with minimal effort.
Phosphates get into your pool year-round from falling leaves, landscape mulch, and organic debris. High phosphate levels interfere with how well chlorine works and keep salt systems from generating enough sanitizer. You can keep adding pool chemicals, but if phosphates are high, you’re fighting an uphill battle.
The tricky part with DIY pool care is figuring out exactly how much more you need as temperatures rise. Not enough, and you’ll wake up to green water. Too much, and you’re wasting money while potentially creating other issues, like elevated cyanuric acid levels.
Increasing filtration for pollen season
During heavy pollen months, run your pool 8-12 hours a day. More is better. This keeps water moving through the filter. Catch pollen before it settles and spreads chemicals evenly so you don’t get dead spots where algae can take hold.
Treating an algae bloom in pool water or replacing a damaged filter costs way more than running your pump a few extra hours daily. Keeping water moving during pollen season prevents the still conditions that allow algae to grow.
If your pool has automation, adjust the schedule now. Bump up those run times before the first big pollen drop, not after your pool’s already green.
Warning signs you need a professional’s help
Structural issues:
- Plaster that’s pitting, peeling, or popping off in chunks
- Tiles falling off or popping loose (means there’s moisture or cracks behind them)
- Cracks in your deck or spots where it’s no longer level
- Hairline cracks in your diving board or slide
Equipment problems:
- Water inside your pool lights
- Lights that won’t stay tight in their housings
- High filter pressure even after cleaning
- Water stays green no matter what chemicals you add
- Equipment that won’t hold its settings
Trying to fix these yourself usually makes things worse and more expensive to repair. When you spot any of these issues, professional seasonal pool maintenance can assess the problem and prevent it from escalating.
Common spring pool questions
Why is my pool green?
Green water in spring usually means pollen or algae. Pollen makes a yellow-green film that brushes away easily. Algae sticks to walls and floors in patches that resist brushing, and the water looks murky instead of just tinted.
Checking the Houston Health Department’s daily pollen and mold count helps you determine whether you’re dealing with an environmental issue or a chemistry problem. Pollen needs better filtration and debris removal. Algae needs chemical treatment.
Do I need to replaster?
Pool plaster usually lasts around 10 years. Pits and rough spots give algae places to hide and feel rough on bare feet. A professional assessment tells you if your plaster needs replacing or if spot repairs can buy you more time. Once pitting becomes widespread or the plaster starts to come off, pool renovation becomes necessary.
Get ahead of swim season
Swim season preparation saves time, money, and headaches. Proper spring maintenance costs a fraction of emergency repairs, water replacement, or equipment failures during peak swimming months.
Your pool should give your family and friends a place to cool off and relax. Not turn into endless chores and chemistry puzzles. At Olympia Pools & Spas, we assess exactly what your pool needs for the season ahead, set up maintenance schedules that fit your situation, and ensure equipment works when you need it.
Contact us to schedule an assessment of your pool’s readiness for swim season. We’ll check your equipment, test your water chemistry, and give you straight answers about what needs attention before everyone starts jumping in. Your pool should be ready when you are, so all you have to worry about is swimming.