Water supply timer

This was the cheapest (RM24) I could find that was semi programmable.

Runs on 2xAAA batteries. First problem we encountered was that used batteries from an AC remote didnt work on this. The timer had difficulty switching on or off more than once. On the AC remote the same batteries were good enough. The display was clear and all buttons worked fine from distance.
A set of new batteries did the trick for the water timer. So I wonder how long they will last before the same issue pops up.

Here it is installed. I didn't turn on the tap too much. Figured the less pressure the better for the timer.

I set it for 3 mins per 24 hours. The water output was about 16 litres. It will feed into the water reservoir in the evening. The reservoir has a pump feeding the fish ponds. The output is about 2 litres/minute. I set the pump to 3 mins at 11am and 4 mins at 2pm. So the ponds will be fed at the warmest hours. If my calculations are right, the reservoir should overflow a little in the evening and that will water that tiny patch of the grass.

11Dec2019 update: the day after. i looks like it worked but my calculations slightly off. The reservoir didn't overflow. Almost to the top. Lets see over the next few days

13Dec2019 still ok