oxyhacker
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Sorry, I had assumed from the MCH6 that is was a Coltri, but it's an Aero Sub, and they use a two little canisters instead of one bigger one. Nothing like a photo to cut through the confusion. I seem to recall the cartridges may be even a bit shorter than the Coltri ones, a scary thought indeed.
Since you already have a decent larger cartridge, which will last longer, do a better job, and be cheaper to operate, I'd keep the two stock separators, and get rid of the two media stacks that the previous owner tried to turn into additional separators. You can probably sell them since people are always looking for filter stacks (or they could be turned into separators) or small filters to make portable travel filters out of. Though how practical this would be will depend on whether cartridges are available for it - I couldn't find anyone who lists them but LF may be able to come up with some.
If you still want to add drains to the other the cartridges, since they are all drilled on the side already, I wouldn' hesitate to add another hole, but it should be done right (right size tap drill, done in drill press or milling machine, not freehand, etc).
Since you already have a decent larger cartridge, which will last longer, do a better job, and be cheaper to operate, I'd keep the two stock separators, and get rid of the two media stacks that the previous owner tried to turn into additional separators. You can probably sell them since people are always looking for filter stacks (or they could be turned into separators) or small filters to make portable travel filters out of. Though how practical this would be will depend on whether cartridges are available for it - I couldn't find anyone who lists them but LF may be able to come up with some.
If you still want to add drains to the other the cartridges, since they are all drilled on the side already, I wouldn' hesitate to add another hole, but it should be done right (right size tap drill, done in drill press or milling machine, not freehand, etc).