Hi everyone, just a bit of advice needed. I always get my salt water from my LFS for £1 a gallon and just wondered how feasible it would be to get an RO unit and make up my own. Before I started the hobby I looked into getting one but would have to pay around £40 for a 2nd hand unit, then £50 or whatever it is for the bucket of salt. I will be needing 18 litres of salt water per week (if I'm doing 10%water changes but thinking of upping it to 20litres) by the time I have finished buying everything I need I'm just unsure whether or not it is worth it. Like how long does a bucket of salt last? Cheers everyone.