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I'm looking to upgrade my pool pump from a 32mm (1 1/4 inch) to accept a 50mm (2 inch) flow. I'm doing it because i want to use a heat pump (3kw hydro-s) which uses 50mm pipes. My pool is a 12ft diameter 2ft deep Jilong above ground pool with 32mm inlet and outlet (typical to intex/bestway style). I'm also upgrading filter pump to a sand filter (Hydro-Fit Filter Set) - this accepts both 32mm and 38mm. However the heat pump only accepts 50mm. I've been told about a couple of options so far: 1. (using type B adaptors at inlet/outlet and more rigid pipe) Intex type b adaptor on to pool £21.99 x 2 Large Intex hose £21.99 Pipe and fittings for heat pump £50 bypass kit 50mm to match heat pump £79 2. (using t piece hosetails) bypass kit £44 (38mm)6m of hose £18 (@£3 per/m)T piece hosetails x2 (32mm) £2.20 each (£4.40) I think I would need more stuff than no2 method above (dont think the company who quoted me that stuff fully understood my requirements). i've heard some cut into the pool lining to avoid downsizing the pipes, but i dont want to mess this up. the max flow from the heat pump is a bout 2.5m3 and 4m3 from the filter pump. would reducing the pipes from 50mm down to 32mm limit the performance of my heat pump? Or would the velecity increase and make up for it? any ideas please?