If you make ice cubes with reverse osmosis water, they will be cold and hard enough to not need any type of insulation on your machine. Sometimes I wash my leftover cubes until they are clear again and leave them in the bubble magic overnight. Most of it still remains the next morning.
my 2...
more surface area does equal more oxidation, so it would be best to grate the hash like we do. instead of it being in a ball or a block, it is in tiny pieces. This and RO water are the two things that keep hash it's true color. I make all of my ice by hand in trays with the RO water. clean...
imo, sometimes names do matter in the glass world. I still cannot find any inline bubbler that compares to a HOPS. He measures everything perfectly and has the most consistent product.