watering properties

So I've got a decently large op but i don't use a reservoir i use two liter and gallon jugs too water, should i give my plants chemicals all the time or stick to the every week or every other week? i understand chems such as sweet that get used every watering but the rest have got me slightly puzzeled. I haven't had a problem with my way of doing it just wondering if I'm underproducing due to an incorrect feeding schedule. any thoughts are appreciated.
 
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