Ppms tap water and build up

Alright so my babys look alright but still concerned my tap water ppm is 150-180
Phed to 6 i tested some runoff today and its coming out 500-600 is it salt build up should i flush them.

Im so confused should the ppms going in be the same coming out

3 plants look different from eachother they are photo
 

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teddy bonkers

Well-Known Member
run-off means nothing and testing it will tell you nothing. learn to read the plant, if there isn't any problems, why look for or create them?
 
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