RO/DI water is the backbone to a healthy aquarium. Free of polutants, it will ensure nothing bad gets introduced to your aquarium through contaminated water. For those with small aquariums or small spaces, it doesn't pay to make your own water. For local pick up in Central New Jersey, I provide fresh RO/DI watter for $1 per gallon and salt water mixed with RO/DI watter for $2 gallon. Contact me to set up a time for pick up.