Is the Hayward s210 pro series 21" top mount above

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32' round by how deep? Flow rate is how you size a filter so with total gallons you can calculate how many per minute will add up to the whole pool being turned over is 6-8 hours. The pump and filter are then sized for that required flow...Assuming the pool is an above ground ~4' average depth then total gallons would be about 24,000 gallons. For an 8 hour turnover you would need about 50 gallons per minute. The 210T, T for top mount, is designed to handle up to 44 gallons per minute and turn over a 21,000 gallon pool in 8 hours or a 26,000 gallon pool in 10.

What that basically means is that using a 210 on a pool 32 x 4 would be pushing it. It will work but you will end up backwashing more frequently which raises the overall cost of running the pool. If it is not to late a 24" filter would be better; especially if you have periods of time in your pool season where heavy amounts of debris such as pollen get into the water. A 21" filter won't handle any over a normal filtration load.

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