Yup – I would agree with Henry.
It might be “low teck” but it certainly works – and the cost ? None !! Hard to beat that price !!
The only “gotcha” or weak point – is the dependency on a person doing it everyday, and doing it correctly.
Where as I would suggest automating the complete procedure & and then hooking it, to a timer to run on any schedule desired (with a log of course 
But automation – ain’t free
