For the past three years we have had great luck with our current liquid chlorine setup using a Stenner Pump with an Intermatic Timer. Every year I try to research something new about the pump and read about other people's setup in an effort to make my setup better and last longer. One thing I am interested in learning about is peoples choice in dosing all their chlorine once per day or multiple times per day. Currently we use the 45M series adjustable pump. We have a #1 tube (smallest diameter) and dose for 50 min every four hours. We use about 100 gallons of chlorine from May 1- October 15ish. When we first set this up we wanted to maintain a constant level versus dose heavy once per day and have it burn off. This was just a choice by us and I'm not sure if it is the best option and I'm sure it's not the most efficient but it seems to work great for us. By doing this we maintain 2-3ppm all day everyday throughout the summer. The reason we went with the #1 tube is because we were told that when you have the adjustable pump if you run it anywhere from 1-9 you can wear the "plate" out faster. Every time it clicks on or off it wears the plate out. We probably could have saved money and just got a single speed pump and adjusted the dosing via our timer or tube size but we didn't. We replace our #1 tube every year and use the black UV tubing, which we haven't had to replace. Every year when we close the pool I clean the black tubing and let it soak in Simple Green and CLR and it seems to clean it up great. This will be the first year I perform more in-depth annual maintenance. I ordered the maintenance kit that comes with new fittings and rollers, not because I noticed ours wasn't performing well but because I want it to work well for a long time. Our pump is mounted outside with the rain roof. We installed the rain "sock" but it kept overheating the pump so we took it off. With the rain roof only we haven't had any issues with rain or weather. This year we will be adding a second pump for our acid. It will be on a separate timer and run at different times. I haven't done the calculations yet to determine how often it will run but I can't imagine it will be very often. I just got tired of handling muriatic acid and the gas cloud it lets off and wanted to automate it. If you have any tips, tricks, or general knowledge I'd be interested to hear.