If you’ve ever spent the weekend troubleshooting a pool that’s cloudy, has a weird chemical smell, or just won’t hold a consistent temperature, you know how frustrating it can be. As someone who’s spent the last decade designing, installing, and servicing pool purification systems, I’ve seen everything from a well-maintained system that’s still running like a dream after 15 years to one that’s been neglected so bad it needed a full replacement in two. The good news? Most of the common issues with pool purification systems aren’t random—they’re avoidable with consistent, simple maintenance that anyone can do, no fancy certification required. And since I’m not just here to give generic tips (I’m a Purification System supplier, so I know exactly how every part of these systems works), I’m breaking down the step-by-step, science-backed ways to keep your pool’s purification system running at peak performance. Purification System
First, let’s get one thing straight: your pool’s purification system isn’t just the filter—it’s a whole team working together. There’s the pump that moves water, the filter that traps debris, the sanitizer (usually chlorine, salt, or ozone) that kills bacteria, and the valves and pipes that keep everything flowing smoothly. Each part relies on the others, so skipping maintenance on one throws the whole system off. I see this all the time with new customers: they’ll call me complaining their salt chlorinator is broken, only to find out the pump’s impeller was clogged with leaves for weeks, so not enough water was reaching the chlorinator in the first place. That’s the kind of mistake that’s easy to avoid with a quick, weekly check-in.
Let’s start with the workhorse of the whole system: the pump. The pump’s job is to push all pool water through the filter, so if it’s not working right, nothing else does. Most people don’t realize how much a pump’s condition affects the entire purification process. First, check the strainer basket every single week. That’s the little removable basket at the front of the pump, right where water flows in. Leaves, bugs, hair, and even small toys can get stuck here, and if the basket’s half full, it restricts water flow like pouring water through a straw. When flow is restricted, the filter can’t do its job properly, and sanitizer doesn’t circulate evenly. I always tell my customers to make this the first thing they do when they finish their weekly pool cleaning—don’t wait for the water pressure gauge to drop (though you should check that too). A quick dump of the basket in the trash, a quick rinse with a garden hose, and you’re done in 2 minutes.
Next, check the pump’s pressure gauge (if you have one) every month. Normal operating pressure is usually between 10 and 25 PSI, but every system is different, so make note of what “normal” is for your pool. If pressure rises by 5 PSI or more, that means your filter is dirty, and it’s time to backwash or clean it. If pressure drops, that means there’s a leak in the system, or the strainer basket was left empty—something’s disrupting flow. I once had a customer whose pressure dropped suddenly, and it turned out a squirrel had chewed through a section of their suction line. If you notice a pressure drop, don’t ignore it; a small leak can waste hundreds of gallons of water a month and put unnecessary strain on the pump, shortening its lifespan.
Speaking of strainers, don’t forget to clean the impeller a few times a season, especially if you have a lot of trees around your pool. The impeller is the small fan inside the pump that actually moves water, and it can get clogged with small debris that makes it spin slower. To clean it, turn off the pump, disconnect the strainer lid, and remove the impeller cover. You’ll probably see a buildup of slimy algae or small leaves—just wipe it out with a soft cloth, no harsh chemicals needed. This takes 5 minutes and can prevent you from having to replace a pump that’s only 3 years old because it was working too hard.
Now, the filter: this is the part that actually traps all the dirt and debris that the pump pulls in, so it’s critical that you maintain it properly. The type of filter you have changes the maintenance, but I work with all types here at my Purification System, so I can cover the main ones: cartridge, sand, and diatomaceous earth (DE) filters.
For cartridge filters, which are the most common for residential pools, the rule is: backwash (wait, no—cartridge filters don’t backwash; they need to be rinsed or cleaned when pressure rises). As I mentioned earlier, when pressure goes up 5 PSI from normal, it’s time to clean the cartridge. Most cartridges can be cleaned with a simple hose rinse: take it out of the filter tank, spray it down with a high-pressure garden hose, working from the inside out to push debris out. If it’s extra dirty (like if you had a lot of pollen or algae in the pool), you can soak it in a mild filter cleaner (never use household bleach or acid, that can damage the cartridge) for a few hours before rinsing. Cartridge filters last 2-3 years with regular cleaning, but if you skip cleaning them, they’ll get so clogged that water can’t flow through, and you’ll end up with cloudy pool water.
For sand filters, backwashing is the key. Backwashing is just reversing the flow of water through the filter to push trapped dirt out to waste. You should backwash when pressure rises 8-10 PSI from normal, which is usually every 4-6 weeks during heavy pool use (summer) and every 8-10 weeks in the winter. How do you do it? Turn the pump off, set the multiport valve to “backwash,” turn the pump on for 2-3 minutes until the water coming out of the waste line is clear, then turn the pump off, set the valve to “rinse,” run it for 1 minute, then set it back to “filter.” One common mistake here is not rinsing after backwashing—if you skip that, small particles of sand will get pushed back into the pool. Also, every 3-5 years, you need to replace the sand in a sand filter. Over time, the sand becomes too fine and gets coated with minerals, so it can’t trap debris anymore. If your water is still cloudy after backwashing, that’s probably the issue.
DE filters are the most efficient, but they’re a little more high-maintenance. They use a fine powder (diatomaceous earth) to coat the filter grids, trapping even tiny particles that cartridge or sand filters miss. For DE filters, you need to backwash when pressure rises, same as sand filters, and then you have to “add” fresh DE after backwashing. The amount depends on your filter size—usually 1-2 pounds of DE for a residential filter. Skipping adding DE will mean your filter isn’t working at full efficiency. I always tell customers with DE filters to mark their calendar to add DE right after backwashing, because it’s easy to forget and end up with a filter that’s not doing its job.
Now, let’s talk about sanitization, because even the best filter won’t keep your pool clean if the sanitizer isn’t working. Sanitizers kill bacteria, algae, and other pathogens that get into the pool from swimmers, dirt, or rain. The most common sanitizers are chlorine (liquid, granular, or tablet), salt chlorinators, and ozone systems, and all of them require consistent maintenance.
First, test your sanitizer levels every week (twice a week in the summer). For chlorine, the ideal level is 1-3 parts per million (PPM). Too low, and bacteria grows; too high, and you’ll have that strong chemical smell (that smell is actually chlorine combined with bacteria, not pure chlorine, which is why it smells that way). For salt chlorinators, test the salt level in your pool every 2-3 months. Most salt systems need between 2500 and 4500 PPM of salt, so if it’s too low, the chlorinator can’t produce chlorine. I see this all the time: customers get a salt chlorinator installed, never check the salt level, and a year later, the chlorinator stops working because there’s not enough salt. It’s a simple test—just dip a test strip in the water, and you’re done.
Also, don’t forget to check the pH and alkalinity of your pool water every week, too. pH is the measure of how acidic or basic the water is, and ideal pH is 7.2-7.8. If pH is too low, it’s acidic, which can corrode your purification system parts (pipes, pump, even metal ladders) and make chlorine less effective. If pH is too high, chlorine doesn’t work as well, and you’ll get cloudy water or scaling on the filter. Alkalinity is the buffer that keeps pH stable, so ideal alkalinity is 80-120 PPM. If alkalinity is off, pH will bounce up and down every time you add chemicals, which makes maintaining sanitizer levels impossible. I always tell customers to balance pH and alkalinity first, before adjusting chlorine or salt levels—they’re the foundation of good water chemistry.
Another often-overlooked part of the purification system is the regular maintenance of auxiliary components, like automatic cleaners, skimmers, and valves. Skimmers are the parts that sit on the pool’s edge and pull in surface debris (leaves, bugs) before it sinks. Make sure the skimmer weir (the little flap that opens and closes as water flows) is working properly—if it’s stuck open, it can’t pull debris in, and if it’s stuck closed, water flow is restricted. Every month, remove the skimmer basket (separate from the pump strainer) and clean it out, same as the pump basket. Automatic pool cleaners (like pressure-side or suction-side cleaners) are a great addition, but they need maintenance too. Clean their filters every month, check hoses for leaks, and make sure they’re getting enough water flow from the pump. A cleaner that’s not working means more debris building up in the pool, which makes your filter work harder. Valves, especially the multiport valve on sand or DE filters, can get stuck or leak over time. If you notice water dripping from the valve, or flow is inconsistent, lubricate the valve gasket every year, or replace the gasket if it’s worn out. This is a cheap fix that can save you from having to replace a whole valve later.
Seasonal maintenance is just as important as weekly or monthly checks, especially if you live in an area with cold winters. If you close your pool for the winter, don’t just turn off the system and walk away. First, balance the water chemistry (pH, alkalinity, sanitizer) before closing—this prevents algae growth and corrosion over the winter. Clean all filters thoroughly (backwash sand, rinse cartridge, dispose of old DE), drain the pump and filter lines to prevent freezing (water expands when it freezes and can crack pipes or the pump), and cover the system with a protective cover to keep debris out. If you keep your pool open in the winter, reduce the run time of the pump (to 4-6 hours a day, instead of 8-12 in the summer), test water chemistry every two weeks, and make sure the system is protected from cold temperatures. I once had a customer who skipped draining their pump lines for the winter, and they ended up with a $2,000 repair bill when the pump and pipe cracked from freezing. That’s a mistake that’s totally avoidable with 30 minutes of work in the fall.
Now, let’s talk about common mistakes that even experienced pool owners make, because avoiding these will keep your purification system running smoothly for years. First, don’t overwork the pump. A lot of people think running the pump 24/7 will keep the pool cleaner, but that’s not necessary, and it wastes electricity. The ideal run time is 8-12 hours a day in the summer, depending on your pool size, and 4-6 hours in the winter. A timer is an affordable way to set this automatically, so you don’t have to remember to turn it on and off. Second, don’t ignore small problems. If you notice a tiny leak, or a filter that’s not clearing as fast as usual, fix it right away. A small leak can turn into a big one that damages the system, and a slightly clogged filter can turn into one that needs replacing entirely. Third, don’t use generic or wrong chemicals. A lot of people grab the cheapest chlorine from the store, but using the wrong type or adding too much at once can damage your filter or pump. As a Purification System supplier, I always recommend using chemicals that are designed for your specific system type—for example, don’t use DE in a cartridge filter, and don’t use granular chlorine in a salt system without checking with a professional first.
Finally, if you’re ever unsure about something, don’t hesitate to reach out. Whether it’s a clogged impeller, a pressure that won’t stabilize, or a new system you’re trying to set up, the team at my Purification System is here to help. We design and install residential and commercial pool purification systems, and we offer maintenance plans for customers who want to make sure their system is always running at peak performance. We can also help you troubleshoot issues over the phone or in person, so you don’t have to deal with a cloudy pool or a broken system that’s ruining your summer.
At the end of the day, maintaining a pool purification system isn’t rocket science—it’s about consistent, small steps. A 2-minute check of the pump basket every week, a quick filter cleaning when pressure rises, balancing water chemistry monthly, and seasonal prep in the fall and spring is all it takes to keep your pool clean, clear, and your system running for years. Neglecting these simple steps might save you a few minutes now, but it will lead to bigger problems later—higher energy bills, expensive repairs, and a pool you can’t enjoy.
If you’re looking to upgrade your current pool purification system, or you need help with maintenance or troubleshooting for your existing system, we’re here to work with you. Whether you have a small residential pool or a large commercial one, we can design a system that fits your needs and provide the support to keep it running smoothly. Reach out to our team to discuss your pool purification needs, and let’s make sure your pool is the best part of your summer.
Liquefaction Storage Equipment References
- American National Standard for Swimming Pool Components, ANSI/APSP-7
- Pool & Hot Tub Alliance, “2024 Residential Pool Maintenance Best Practices”
- Centers for Disease Control and Prevention (CDC), “Swimming Pool Water Chemistry and Disinfection Guidelines”
- Water Quality & Health Council, “Proactive Maintenance for Pool Circulation and Filtration Systems”
Xinxiang Jiale Intelligent Equipment Co., Ltd.
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