I'm in the midst of automating my pool. Last year I did the manual addition of liquid bleach and bleach turning the pump on and off by hand. This year I've assembled a controller (old PLC and HMI) that will allow me the 'schedule' pump running along with running a Stenner pump to add the chlorine. However, as I was selecting a pump (45MHP10, adjustable from 1/2 to 10 GPD) I was confronted with a choice: 1/4 or 3/8" tubing size. The 3/8 causes the price to go from $299 to $312. What's the difference? What do other people choose? Thanks for the help.