Will using cal mag plus up untill harvest affect taste

Im growing in organic soil and i have been feeding them mostly cal mag plus with ro water for the last 2 weeks. Should i give them a watering of plain ro water before i harvest or is it ok how i have been doing it?

smoking my plush berry with no taste other then amazing tropical goodness! i did not use cal mag the last week and only at 5ml per gallon through flowering.