Why Replacing Old Pool Filters and Multiport Valves (MPVs) is Key to a Cleaner, Safer Pool!
- helpme2915
- Aug 27
- 5 min read
As a pool owner, keeping your water clean and clear is one of the most important parts of maintaining your pool. And two pieces of equipment are essential in that process: your pool filter and your multiport valve, also known as an MPV. These parts work together to filter out dirt, debris, and even tiny particles that can make your pool cloudy, dirty, or unsafe to swim in.

But just like any other equipment, pool filters and MPVs don’t last forever. Over time, they start to wear down, become less efficient, and even cause issues in your pool. In this post, we’ll explain why it’s important to replace old filters and MPVs, what signs to look for, and how it can save you time, money, and hassle in the long run.
What Do Pool Filters and MPVs Do?
Before we dive into the importance of replacing these parts, let’s look at what they do.
Pool Filters: The filter is like the lungs of your pool. It removes dirt, debris, bugs, and other unwanted particles that enter your pool. Without a good filter, your pool water would become dirty, cloudy, and even unhealthy to swim in. There are different types of filters, like sand, cartridge, and DE (diatomaceous earth), but they all serve the same main purpose—keeping your water clean.
Multiport Valves (MPVs): The MPV controls how water flows through the filter. It has different settings, like filter, backwash, rinse, waste, and recirculate. The MPV allows you to switch between these settings so you can clean the filter, move water around, or drain it if needed. It’s like the command center for your pool’s filtration system.
Together, the filter and MPV keep your pool water circulating, clear, and safe to swim in.
Why Should You Replace Old Filters and MPVs?
Over time, filters and MPVs wear out from constant use. When they get old, they don’t work as well and can cause problems in your pool. Here’s why it’s important to replace them when they start to wear out:
1. Keeps Your Pool Water Cleaner
An old or clogged filter can’t do its job properly. Instead of trapping dirt and debris, it lets some of it slip back into the pool. This can make your pool look cloudy or even greenish, which is a sign of poor water quality. Replacing an old filter with a new one ensures that the water stays cleaner, clearer, and safer for swimming.
2. Prevents Algae and Bacteria Growth
When your filter isn’t working well, your pool water becomes a breeding ground for algae and bacteria. Algae can make your pool look slimy and green, while bacteria can be harmful to your health. A clean, efficient filter prevents these nasty organisms from growing by trapping them before they get a chance to spread.
3. Saves You Money on Chemicals
When your filter isn’t doing its job, you’ll end up needing to use more chemicals, like chlorine, to keep the water clean. More chemicals mean more money spent and more time trying to balance the water. With a new, efficient filter, you won’t need as many chemicals to keep the water balanced, which can save you money in the long run.
4. Helps Your Pool Equipment Last Longer
When an old filter or MPV isn’t working well, it can cause extra strain on your pool pump and other equipment. The pump has to work harder to push water through a clogged or inefficient filter. This extra work can wear down your pump faster, meaning you’ll need to replace it sooner. Replacing an old filter or MPV helps take the strain off your other equipment, making everything last longer.
Signs That It’s Time to Replace Your Pool Filter or MPV
Not sure if it’s time to replace your filter or MPV? Here are a few signs to watch for:
Cloudy or Dirty Water: If your pool water is staying cloudy no matter how much you clean it, the filter might not be working properly. This could mean it’s time for a replacement.
Reduced Water Flow: If you notice that water isn’t flowing through your pool system as strongly as it used to, the filter could be clogged or worn out. Reduced flow can also mean the MPV isn’t directing water properly.
Frequent Backwashing: If you’re having to backwash your filter more often than usual, it could be a sign that the filter media (like sand or cartridge) is wearing out and needs replacing.
Leaks or Cracks in the MPV: If your MPV has cracks or leaks, it won’t be able to direct water flow properly, which affects the entire filtration process.
Higher Utility Bills: A struggling filter and MPV require more energy to run, which can lead to higher utility bills. If you notice an unexplained increase in your pool’s energy use, it could mean your filter or MPV is due for a replacement.
How Often Should You Replace Pool Filters and MPVs?
The lifespan of a pool filter and MPV depends on their type and usage. Here’s a general guide:
Sand Filters: Replace sand every 3-5 years, and replace the entire filter if it’s over 7-10 years old.
Cartridge Filters: Replace cartridges every 1-2 years, and the whole filter after about 5-7 years.
DE Filters: Replace the grids every 3-5 years, and consider replacing the filter if it’s over 10 years old.
MPVs typically last about 5-10 years, depending on use and maintenance. Regularly checking them for signs of wear, such as leaks or cracks, can help you know when it’s time for a new one.
Benefits of a New Filter and MPV for Your Pool
Replacing an old filter and MPV comes with plenty of benefits that make your pool easier to maintain, safer, and more enjoyable to use.
Clearer Water: A new filter works at its best, meaning cleaner, clearer water. You’ll notice a big difference in how fresh and inviting your pool looks!
Improved Filtration Efficiency: A new MPV and filter can handle water more efficiently, making it easier to remove contaminants and keep the water balanced.
Lower Maintenance Costs: With a new filter and MPV, you won’t need as many chemicals or spend as much time cleaning and troubleshooting issues.
Energy Savings: Your pool pump won’t have to work as hard to push water through the system, which means it uses less electricity, saving you money on your energy bill.
Longer Equipment Life: A new filter and MPV help take the load off your pump, extending the life of your entire pool system.
Why Choose Infinity Pool Solutions for Filter and MPV Replacement?
We understand the importance of keeping your pool’s filtration system in top shape. Our team is trained to assess your current filter and MPV, determine if they need replacing, and provide you with the best options. Whether you have a sand filter, cartridge filter, or DE filter, we’re here to help.
We offer professional installation to make sure your new equipment works perfectly from day one. Plus, we can recommend regular maintenance steps to keep your filter and MPV running smoothly, giving you peace of mind that your pool water will stay clean and safe.
Ready to Improve Your Pool’s Water Quality?
If you’re noticing any issues with your pool’s water clarity, flow, or overall performance, it might be time to replace your filter or MPV. Contact us today, and let us take care of your pool’s filtration needs. Our goal is to make your pool maintenance easier and your swimming experience better, so you can enjoy clear, fresh water all season long.
Invest in a new filter and MPV to keep your pool at its best—cleaner water, easier maintenance, and a longer life for your pool equipment await!






