Help! Water runoff 7000 ppm

First time grower!
coco perlight 70/30
I have been watering around 800ppm until 10% runoff and just checked my runoff and it’s one plant is 7000 ppm the other is 6500. What should I do? The plant seems like the leaves are a little dry and has tiny yellow tips. I did already give a plain watering of just ph water to them yesterday?

you must flush your coco until your read the same values in and out
when i say flush i do not mean with pure water
flush with the regular solution, around 1200ppm(800ppm is too light) at ph 5.8-6.0

for the next waterings if you do not want it to happen again, give Large runoff every feed

you must reset the ph/ec value in your coco every watering if possible, its optimal
if not do periodic waterings with large runoff to correct salt accumulations

so my next feed get it around 1200 ppm how much should I be giving them 3 weeks in? Is a litre each enough or not enough?

you must give enough until your runoff read 1200ppm

always recover the runoff to reuse it, just correct ph/ec of it and give it again to plants

Okay great thanks for the help