how to size a pool filter and pump

Author: PoolKing - Pool Sand Filter Manufacturers

How to Size a Pool Filter and Pump: A Comprehensive Guide

If you're planning to install a new pool, or replace your existing pool filter and pump, it's important to make sure you select the correct size for your needs. Proper sizing can save you money on energy bills and maintenance expenses in the long run. In this guide, we'll take you through the steps of sizing a pool filter and pump, so you can enjoy crystal clear water in your pool all summer long.

1. Determine Your Pool's Capacity

The first step in sizing a pool filter and pump is to determine the capacity of your pool in gallons. To do this, measure the length, width, and depth of your pool, then use a pool capacity calculator to determine the total number of gallons your pool holds. Generally, you'll want to aim for your filter and pump to cycle your pool's water twice per day, which means you'll need a pool filter and pump that can handle the entire volume of water in your pool in 12 hours.

2. Calculate Required Flow Rate

Once you have determined the capacity of your pool, you will need to calculate the required flow rate for your pump. The flow rate is the amount of water that the pump moves in a given amount of time, usually measured in gallons per minute (GPM) or gallons per hour (GPH). Industry experts recommend that the flow rate for a pool pump should be at least 1.5 times the turnover rate of your pool, so a pool that holds 20,000 gallons should have a flow rate of at least 30 GPM (20,000 / 12 hours / 60 minutes per hour x 1.5).

3. Consider Filtration Type

There are three common types of pool filters: sand, cartridge, and diatomaceous earth (DE). Each type has its own recommended flow rate, so it's important to select a filter that matches the flow rate of your pool pump. For example, a sand filter typically requires a flow rate of 25-30 GPM, while a cartridge filter may require a flow rate of 40-50 GPM. Additionally, consider the maintenance required for each type of filter. Sand filters require periodic backwashing to remove debris, while cartridge filters can be hosed off and replaced. DE filters require the most maintenance, requiring backwashing and replacement of the DE powder.

4. Determine the Horsepower Needed for the Pump

Pool pumps come in various horsepower (HP) ratings, ranging from 0.5 to 3. The horsepower of the pump is directly related to the flow rate, so selecting the appropriate horsepower is important. A higher horsepower pump may increase the flow rate but may also increase energy consumption and costs. Use a pump sizing calculator to determine the appropriate horsepower needed for your pool.

5. Take into Account the Plumbing Layout

The location and layout of your pool plumbing can also affect the sizing of your filter and pump. If your pool is located far away from the pump, you may need to select a larger pump or adjust your plumbing to compensate for the distance. Additionally, if your pool has multiple inlets or outlets, you may want to consider a larger pump to ensure that all areas receive adequate water circulation.

Conclusion

Sizing a pool filter and pump may seem like a daunting task, but taking the time to properly calculate the required flow rate, filtration type, horsepower, and plumbing layout will ensure that your pool stays clean and clear all season long. Remember to choose a pool filter and pump that matches the capacity and needs of your pool, as well as the appropriate filtration type and horsepower for your desired flow rate. Happy swimming!