I have used bleach (1 oz/gal), Physan (1 tsp/gal) at a once-every-4- to 6-week regimen, and left the liquid in the reservoirs, and never seen issues, but cannot guarantee that to be "universal".
One grower I know adds Physan to his fertilizer concentrate take (fed through a metering pump), and another to his RO water tank - both in small doses - so it ends up being applied regularly in very low concentrations, and that seems to do the trick.
About 18 months ago I started using Zero-Tol or Oxidate (same chemical) instead of either of those, and it's a lot more plant freindly overall.
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