rained water issue

HI There, I live inna country side and have to use rained water for my ebb&F system because the water I have is from a well so it would be difficult filtering it (up to 2100 ppm different from rained water wich is only 300-450 ppm/ 7.1ph) im using technaflora nutrients Recipe for succes, they have a nice recipe but im a little concerned since I always end up with 3000-4500 ppm even with a half of what they say I exceed the 1100ppm that is advisable( 2000-2500ppm-no ph issues) plants look nice anyways- its the 2nd time im working w/ it, last time I had to flush every week for a couple of days for warning but I guess it could have yielded more if I had done it properly. any advices???

ok right off the meter your using is f-up I love the resipe and when I mix to the resipe it doent go over 1250ppm so you need to look into that.

@hellraizer30 ok but what is the ppm of your water before mixing it? Is it R.O. water?

my tap water ppm is 100 to 150 from a well