Not sure if this is the proper forum for this so if it needs moved OK

How fast will a chlorine/water mixture remain effective at poolside, closed bucket, 2 or 3 day supply?

I'm installing a peristaltic pump to inject bleach directly into the return line. The reason I'm doing this is to stop the Yo-Yo effect of adding a massive dose at night (more like the erosion feeder from days gone by). I would put the reservoir somewhere else but I want to keep the tubing as short as possible.

The pump delivers between 2.5 and 20 GPD so I will probably have to dilute the 6% 50/50 or more. The system will run in concert with the pool pump, with manual metering based on testing.

Also any thoughts about the sunlight (UV) effect on the bleach in the 1/4" white plastic tubing as it makes it way through the system. Should I shield it from the sun? How about the Reservoir??

I'm sure I will use more bleach overall ----- BUT

Any other thoughts are welcome.