If you type into Google “what size sand filter do I need for my above-ground pool?”, you will find some great online calculators you can use to figure out the answer. All you need to do is enter the measurements of your pool, such as volume and pump flow rate, and the calculator will calculate the size of the filter you need.
If you prefer to calculate the size of the sand filter the old-fashioned way, use this formula.
Volume ÷ Turnover Time
= 42,000 L ÷ (8 hrs x 60 mins/hr)
42,000 L ÷ 480 mins
= 87.5 LPM
Then add an extra 20% capacity safety margin = 87.5 LPM x 1.2 = 105 LPM
Where volume is the total volume of your pool in litres, turnover time is the total time it takes to filter the entire pool, and additional losses are a minimum of 20%. So, you should choose a sand filter with a max flow rate equal to or more than 105 LPM.
Keep in mind that this is only a rough guide. Other factors, such as the type of pool you have and its water quality, can also affect the filter size you need. It’s important to double-check all measurements before purchasing a sand filter for your pool. One size higher is aways recommend.
If you need any advice, our team at Hy-Clor can take the hassle out of finding the right sand filter. We will provide all the information you need to find the perfect size pool filter for your pool.