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Won't be an issue...
they will break down other roots well eat them...you will be able to pull on them a bit after awhile be careful if you do. It's pretty much impossible to separate them all.
That's why it's really important to start with feminized seeds with dwc....
I have just had (three weeks ago) to remove a large male from my DWC and did exactly as 'Green75' suggested.
I've had no pH fluctuations or slimy water since so I can confirm it is best to cut the roots.
Where the males roots intermingled with the other females roots I chose to sacrifice more of the other females roots to ensure I got the majority of the males roots out of the system.
The way I see it the females are well established and can grow back any roots that got severed.
I do also use a water chiller to keep the water temps below 19oC, this helps avoid root rot.
If you don't have a water chiller you can use an additive like Botanicare Hydroguard which add healthy bacteria to the reservoir, the healthy bacteria stops the unhealthy bacteria from gaining a foothold in the water.
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