Hi all,
The tips and advice I have received on here has been fantastic so thank you to everyone!
I am currently running the wash in two batches (as still not big enough) and used the copper penny trick, adding a whole pack of ceramic beads, to be safe. I have experienced no issues so far.
The rum has came out very well IMO, little bit of a pink twinge and little flecks of something inside, but this should come out through a Brita filter.

This is my wash before the run (the black dots aren't in the wash, they're on the roof of the conservatory!)

After
I haven't took a FG yet, but I can safely say one thing, it is very strong. Am I able to estimate the proof of this? as even from tasting the drips off my finger it has got me a bit..

unfortunately I did not take a reading during initial mixing.
Thanks again to everyone!