Overall a high quality filter EXCEPT FOR the poorly made frame that 's NOT solid resulting in the frame edges to flop around like they're going to break off if you don't handle it carefully.  Really?  For a high priced filter I would have expected better.   I was considering buying a couple more but not anymore.  Had I not got this at the sale price I'd be returning it.  I've got a plastic framed washable filter that's more sturdy than this and was 1/3 the price!