Plumbing a water-cooled spindle.

[Voicecoil]

You should be aware that Sodium Hypochlorite is somewhat alkaline in solution and hence will attack aluminium a bit. Should be OK on plastics and stainless steel though. Alternatively once the bleach is dissolved you could add a little acid to compensate - you should then have an essentially neutral solution containing some chlorine - how soon this would diffuse out through the piping though I don't know.