These plants have a 2-year 'growth cycle'. [=the plants live and die within two years]
The water is 'cycled' back into/through the system after it has been used.
We have to wait for the dishwasher's wash and dry 'cycles' to end.
(..) - Okay. I'm not talking about this with you. Oh,penny,this is a natural human process,and we're talking about statistically significant savings. Now,if you assume tampons per cycle and a -day cycle... are you fairly regular? Okay,no warehouse store,but we're still on for putt-putt golf,right? (..)2007 TvShow: The Big Bang Theory Title: The Luminous Fish Effect Season: 1 Episode 4