Choosing a Filter Size

Filters are one of the most crucial devices required to maintain a clean, bacteria, and algae-free swimming pool. They help maintain a functional and safe pool for use by keeping the water free from dust, debris, and other contaminants. Most pool owners concentrate only on choosing the correct filtration system, but selecting the right sized filter is equally essential. Selecting a small one for a large pool will require frequent filter replacements and might even break down under pressure, while the one that is too big will work too quickly and powerfully, and might make the pool unsafe. Therefore, it is essential to size the filter properly. 

If you are looking to buy a pool filter, read on about the factors that can help select the right filter size for the swimming pool:  

Pool size

The first thing to consider is the amount of water the pool can hold. You can calculate the pool's surface area based on whether it is rectangular, round, oval, or kidney-shaped.

Type of pool

Whether you have an above-ground pool or an in-ground pool will also affect the filter size. Above-ground pools use smaller filters than the in-ground ones.

Turnover rate

It is the time taken by the pool to cycle the whole water. For most residential pools, filters with an 8 to 10 hours turnover rate are considered enough. Most filters come pre-fixed, while for others, you can set the time manually. 

Flow rate

After calculating the pool's capacity in gallons, compute the flow rate or gallons per minute (GPM) to filter that amount of water in 8 hours. It can be calculated by dividing the total capacity with 8 to get the gallons per hour, and then divide it by 60 to get the actual GPM. The filter flow rate should always be higher than the pool pump's GPM. Another vital consideration includes fixtures like fountains or waterfalls that can add to the GPM needs.

Feet of head

Resistance against the flow of water or feet of head (piping between the pool and pump) also is an essential filter consideration. With the increase in head, the GPM will decrease. You can usually calculate it during the installation, but it is around 40-50 feet in most in-ground pools. 

Pump

After getting the GPM and feet of head, buy the right-sized pump for the pool. It is better to select a bit larger pump than required. 

Type of filter

There are three types of filters - D.E. filters, cartridge filters, and sand filters, each with its pros and cons. The size of the filter will largely depend on the type of filter you wish to have. Once you have narrowed down the preferred filter type, perform the calculations, and choose the filter size accordingly.

Oversized filter

It is always advisable to buy large filters as they are easy to maintain and have better filtering capacity. They can filter even small particles and offer more time between cleaning and backwashing.

Choosing the right filter size is overwhelming for many homeowners. Give a call to the pool service company for assistance in making the right choice for the pool.

Flawless Image Pool Service is a veteran-owned and operated residential pool maintenance team for Hillsborough County. Our Certified Pool Operators provide top-notch pool maintenance, 20 years of experience and reliable service. Call 813-536-3941 today!