My first piece from TAG and couldn’t be happier. Min water level for me is touching the bottom of the second disc, and that’s with another percolating ash catcher. Max water level would be the top of the second disc, if youre looking for the smoothest rip possible that is the water level and this is the piece. I personally use it the most with TAG’s dry catcher adapter and fill the water to right under the second disc to the middle of the second disc. If ur taking chops this is very good but almost too smooth for a classic chop. Glass is absolute quality as well I was surprised it was 7mm and not 9mm like some of their other pieces. Rip it on a table if u can or atleast so the piece is close to 90degrees, it will filter through the percs the best that way compared to a 45 degree rip. Besides that ur good, the ash catcher is a must for me and will prob be for u if u like clean water, an extra $30 for their dry catcher makes a day to night difference in terms of cleanliness and function. For the quality of the percs and strength of the glass, you wont get a better deal anywhere else, period. I got this inspired off of my friends seed of life (SOL) piece that looks exactly like this, the difference, this piece is much larger and $130, the SOL piece is like $330+. Again, for the quality of perc design and function along with the thick glass, you will NOT find a better price anywhere else but TAG. Because of this piece I will be a returning customer.