ppms are at 1100 on only the 12th day

[myko]

, I'm growing Moby dick autoflowers in a dwc setup , my first time growing hydro ...I'm o. my 12 day and my ph is 5.9 but my ppms Is 1100 it was higher but I topped my resevoir with a couple gallons of distilled water ...I fed nutrients foxfarm big bloom and grow big also cal mag I accidently used tablespoons instead of tsp with the cal mag and through everything out of wack..and after ph up and down and adding gallons of water I got the ph right but I can't get the ppms down .
should I just stop bring lazy and change my water or is there a way to bring the ppms down. or shoukd I just let my plants fight through it ? the plants look ok but a couple of them have red stems is that normal? here's some pics the plant in the soil are white widow the little one that looks like its ready to harvest is over a week past the time i harvested the other white widows but all the trichs still look mostly clear what do u all think:

 

[Habosabin]

How many gallons?

Take total ppms in the volume minus total ppm desired. Difference / current ppm/g will give you amount to pump out and replace with RO.

 

[Habosabin]

Is that soil on top of your dwc? How's that working out?

Hard to tell trichomes from that pic. Couldn't see amber.

 

[HunterBrandon]

You have a soil grow. DWC does not use soil at all. What do your roots look like underneath?

 

[myko]

the one bucket is soil I didn't mean to put that picture in there the other 6 are dwc coco coir,perlite, and I had just little bit of hydroton so I mixed it
in one of the dwc pot I did put a thin layer of earthworm casings just to see how it would go ...thats was not a good idea ? I'm assuming.what do I do try to scrap it out ? Or just roll with it and see what happens ? Can it rot and contaminate the plant and the other plants sharing thse same water?

 

[myko]

the one bucket is soil I didn't mean to put that picture in there the other 6 are dwc coco coir,perlite, and I had just little bit of hydroton so I mixed it
in one of the dwc pot I did put a thin layer of earthworm casings in one pot, just to see how it would go ...thats was not a good idea ? I'm assuming.what do I do try to scrap it out ? Or just roll with it and see what happens ? Can it rot and contaminate the plant and the other plants sharing thse same water?

 

[myko]

I'm sorry I don't mean to keep posting but I dont know how to edit my posts ...I made a couple mistakes in my last post ..I meant to say I have coco coir ,perlite,and hydroton in all the pots and in one pot I put a thin layer of casings