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The main things to consider on the pump: Sized for YOUR POOL, Quiet operation, energy efficient.

I run my pump from 11AM to 3 PM. I want my water to circulate at the maximum sun portion of the day. I also kick the pumps on when I am swimming.

In florida, for the summer, you may want to invest into an extra pump, with lines a mist rod or 2, to help cool the water. It sprays water into air in a mist, to evaporatively cool the pool.

Again, beacuse you are not going to be around, you will want some extra features to make to pool as self maintaining as possible. Salt System, pH control, self cleaning (not a pool cleaner, but the MDX jet system to drive all the dirt into the filters), etc. Don't go cheap on these. You do not want to return to a green mess.

Me? I run normal chlorine. I check the levels a couple of times a week and throw in the 3" tables once a week, acid 1-2 times per month. I spend 30 minutes a week on the pool. With the full automation, the only thing you'll do is clean the filters about every 3 months.