Apex programming help

I have a "forgetfulness" issue... twice now I have turned my timer-based topoff ON to raise my water level a little bit and LEFT IT ON ALL DAY. So, to avoid kalk-storming my tank again, I'm wondering if there is any code I can use to turn my topoff on for only a short time (20 min or so) then it turns off by itself. My initial idea was to just use a feed timer, but I'm not sure how to program something to be ON during feed and then turn off when feed timer expires. Possible? (yeah yeah yeah... I know I need to use float switches instead...)
 
You can use osc command to do timing through out the day

You can prog feed button to go for 20 min if you want. But 20 min of Kalk is just asking for trouble

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yeah I suppose it's mostly just laziness. I should probably just add some ro water buy hand in that situation... But yes I use the osc for my top off throughout the day
 
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