Careful with RO water from LFS! I was buying it for years and always wondered what kinda purification system they had to make and storetht much water... especially if t was really that well filtered. 50? a gallon for "RODI" and $1 a gallon for salted (eastern LI). I then decided to test the water one day... 18 TDS on my meter. Guess it explains the little bits of diatoms and why I have to clean my glass every 2 days. I recently purchased my own RODI unit and am putting out 0 TDS for my tank. My first hint that thre may be something fishy about how great the water was, was when I asked what kind of salt mix they use there for the water and the worker said usually ESV but sometimes others... Yea, I'm sure the LFS measures and mixes up ESV for their wholesale water. Just as likely as their "RODI" passing through a RO membrane and clean DI resin. Idk, maybe I'm wrong, but my 18 TDS reading leads me to say otherwise. So would say I'd be impressed if I found anything higher grade than Instant Ocean going into their holding tanks.