A shower filter that removes all the metals and minerals from your water, ensures that your skin feels softer, you hair looks shinier, and if you have highlights or single process, it will help it last longer. The Hello Klean Shower Filter (£65) not only looks great (something you can't say about a lot of filters on the market), but it's also one of the most sustainable options. Buy the metal canister once, and then going forward all you have to do is buy the refill capsules — all of which come in very eco-friendly packaging.