i am an small businessmen who deals in industrial and home RO, water softener.
i want a software which provide me reminder or alert when service of RO had due.
if today i sale a ro after that one sms or mail should be gone for my customer as well as me.
then after 90 day one more alert will go same .
there are three time of period which will be defer as work
like water softener and service may be defer.
reminder time will be customize.