Need some advice/help

So I have 6 plants in a wilma system, The roots on all plants have got in the the reservoir. One of the 6 plants will be ready in 1-2 weeks. How can I flush it without flushing all the other plants?

1. I can either not flush

2. I can cut the roots the are in the reservoir and just water it maually with plain water.( I dont like this idea but its all I could think of )

HELP!!!

I don't think you can. How far off are your other plants?

You wont be able to.......... u will have to try and remove the one thats ready and put in another system.