Ok soil growers, I need advice on how to flush my soil after a burn??

First time Dirt grower.

I added my nutes, which was less them the recommended feeding, but on one of the strains its showing signs of burns on lower fan leaves.

I'm growing them in 3.5 gallon pots, with standerd garden soil, I added perilite and vermiculite as amendments.

I fed the plants (which are about a month old) and two days later I seen small rust spots forming on the leave, I flushed the plant with 6 litres of plain PH'D water untill the run off read 1200 ppm.

This slowed the progression of the burn but has not stopped it.

Is this still to hot? 1200 ppm is a cake walk with my hydro plants?

what is the recomendation?

Thanks
Matt

When Flushing flush with three times the aamount as the pot.. So you wanna flush about 10.5 gallons through it.. Idk if that was your question.. But, i hope it helped a little

you can get away with 2x the amount.