Hayward S166T ProSeries Sand Filter, 16-Inch, Top-Mount vs Hayward EC40AC Perflex Extended-Cycle D.E. Pool Filter

The Hayward S166T ProSeries Sand Filter, 16-Inch, Top-Mount and Hayward EC40AC Perflex Extended-Cycle D.E. Pool Filter make for good, if unremarkable, Pool Filters at their respective budgets.

With that said, while they both should serve reasonably well, you might want to look into other options at the $660 and $420 price points - it's likely that there are some better alternatives available.

If you want to learn more about the Hayward S166T ProSeries Sand Filter, 16-Inch, Top-Mount and the Hayward EC40AC Perflex Extended-Cycle D.E. Pool Filter, however, we prepared a summary of the information that we have:

The Hayward S166T ProSeries Sand Filter, 16-Inch, Top-Mount hasn't managed to perform well enough to earn a place in any Pool Filter roundups conducted by sources that do their own, high-quality, hands-on testing. That alone makes it a hard product to recommend.

As for the Hayward EC40AC Perflex Extended-Cycle D.E. Pool Filter - it wasn't considered to be a good enough purchase to earn a spot in any roundups conducted by sources that perform objective hands-on testing, which typically indicates that a product isn't worth its asking price.

As a last step, we wanted to do a head-to-head Hayward S166T ProSeries Sand Filter, 16-Inch, Top-Mount vs. Hayward EC40AC Perflex Extended-Cycle D.E. Pool Filter comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.