Hi all, stupid backwash hose question. We had gone through several cheap b/w hoses that Mr PB included (they always bust holes easily). Finally got a good one that has no issues, but it's only 25' and really need a 50 footer. Here is my issue. If I flatten the current hose, it measures 2.5" across. The pipe from the filter has a reducer fitting on the end which measures a 1.5" diameter. Sooooo, do I need a 1.5 or 2" hose (and have not seen any 2.5" ones, but the current one is 2.5 across (when flattened). It appears stretched perfectly over the end of the reducer, and not bunched up (as i would expect of a larger diameter hose clamped onto a smaller pipe). Of all the pool equipment stuff, never imagined this would be a difficult purchase!