1150 ppm

No saint person does any flush in soil. Normally you would prolonged plain waterings for a week or two, depending on overfeeding signs. You wash out all fauna and micros, if heavily loaded pot with small plant stays long moist , it can change pot ph and new troubles starts. Anything between 800-1200 ppm in soil is ok. Pre loaded ones if flushed for run off test - could show 2000-2500 or 3000 ppms... Dont overdo things, keep it simple. Lift pots to know when to water.