I'm upgrading from a single speed Whisperflo to a VS pump. My pool service company has recommended the Intelliflo i1 pump, advising that it matches my TR60 filter size more appropriately. In researching here on TFP, it seems the Intelliflo VS (part no 011018) is the commonly preferred Pentair choice. My pool is an 18x36, app. 28000 gallons, Pentair TR60 sand filter, 2" plumbing. Looking for any advice on which VS pump to go with and any reason why the 011018 wouldn't be a good choice for my pool. One other factor is that my pump is about 2 feet higher in elevation from the pool and about 2o feet from the pool, about 40 from the skimmer and drains. I've always had trouble pulling prime if my pump was shut off for any length of time so have wondered if the 1hp might be undersized. Anyway, any insight would be much appreciated.