I'll reply in more detail later.

BUT . . . I would be very, very wary of an Hayward 270T selling for $200 off the Amazon direct price. Amazon makes some effort to keep out counterfeit parts, but is only somewhat effective. If Hayward is manufacturing in China, it's more than possible that what's being sold on Amazon are quality-control rejects, NOT approved for sale by Hayward.

You might want to call Hayward and ask. https://www.hayward-pool.com/shop/en...ontact-us-main

Regarding filter sizing: what size piping do you have? Are all the returns supplied by a SINGLE line? Are all the skimmers serviced by a SINGLE line? Is the main drain serviced by the SAME line as the skimmers? Is the suction piping laid out as a 'train-wreck'? (http://www.poolforum.com/pf2/showthread.php/14444 )