I decided to just go against all the advice people have given me and followed me gut, so…
I flushed it with 3 gallons of a Florakleen mixture with tap water (67ppm, 6.4 PH). Then I let it dry out until it stopped dripping and watered her with the following (per gallon):
That came out to a PPM of 325. I ph’d it to 5.89 and watered to around 10% run-off. The run off was PH 6.23 and PPM of 1950. I’ve been advised that 1950 is way too high, so I am going to go flush some more.