what is a spider gasket on a pool filter

What is a Spider Gasket on a Pool Filter: Everything You Need to Know

When it comes to keeping your pool clean, efficient, and in top condition, your pool filter is an integral component. But do you know everything about keeping your pool filter in working order? One of the most critical parts of a pool filter is the spider gasket. If you're not familiar with spider gaskets and their importance, don't worry, we've got all the information you need.

What is a Spider Gasket?

A spider gasket, also known as a multiport or diverter valve gasket, is a component found in a pool filter's multiport valve. The valve divides the water flow into multiple directions, and the spider gasket sits at the valve's center, where it seals the water flow off to each direction, depending on the selected valve position.

Types of Spider Gaskets

There are mainly two types of spider gaskets- the flat and tapered. While each of these gaskets is essential and performs the same functions, they're shaped differently and offer distinct advantages.

A flat spider gasket is designed for older valves that use a flat valve seat surface. If your pool has an older filter valve, you'll need to go for flat spider gaskets to ensure a proper seal. They're pretty uncommon in modern valve designs.

On the other hand, tapered spider gaskets are found in modern valve designs and are made to be fitted into tapered valve seats. They tend to be more efficient in sealing water and require less tightening.

How Does a Spider Gasket Work?

When you position the multiport valve to filter mode, it signals the water to run through the filter, shutting off the return jet. The spider gasket ensures that the pool water goes through the filter before returning to the pool via the return jet.

However, when you need to backwash, the spider gasket blocks the filter inlet and redirects the water through the valve's waste line instead of going through the filter.

When to Replace a Spider Gasket

Just like any other mechanical component, spider gaskets tend to wear and weaken over time. This can cause the filter to leak water and lose efficiency. Here are signs that your spider gasket may need a replacement:

- Water leaks from the filter valve

- Poor filtration even after backwashing

- Trouble maintaining suction

- Water loss while cleaning the pool

- Difficulty positioning the valve

- Worn or flattened gasket

Replacing a Spider Gasket

Replacing a spider gasket isn't usually a complicated job, but it may be a little intimidating for first-time DIYers. Here's a simple guide to help you replace your spider gasket:

- Remove the handle and hardware from the top of the multiport valve.

- The spider gasket is attached to the diverter plate in the center of the valve body. To access it, you'll need to lift the plate out of the valve body.

- Once the plate is removed, replace the gasket and make sure it's sealed correctly.

- Reinstall the diverter plate and secure it in place with screws.

- Finally, reattach the handle and other hardware.

Final thoughts

In summary, a spider gasket is an essential component found in your pool filter's multiport valve. Its primary function is to seal off the water flow to various directions, depending on the selected valve position, ensuring the pool water goes through the filter before returning to the pool via the return jet. Understanding how it works and recognizing when to replace it can help prolong your pool filter system's lifespan and performance.