Still haven't fully opened my pool yet, Water temp is hovering around 48*, so some basic circulation is all I have going for now.
Waiting on filling for a couple of things: Getting my heater up and running -- adding more heat exchanger surface area , and needing to make a more aesthetically pleasing repair to the sidewall rip from two winters ago.
Home made peristaltic chlorine feeder is on hold for now, until I have the pool fully open.
Another project I've been working on is a microcontroller based water temperature probe set. When installed, it will have pool, heater in and out, and ambient air readings, updated every 5 minutes. Many would probably question the addition of the heater inlet probe, but I have found there can be a couple of degrees difference due to the pipeline heat loss. But then, that may have been from my testing methods. We'll see, when I get it installed. This is, after all, an experimental build. If anyone is interested in doing something similar with their pool, let me know and I'll guide you through it.