it got me thinking as i heard that u are supose to replace your tank every few years. is that true? it seems most have their tank for 10 years ish then start to worry lol sure i heard these tanks of today can last a bit longer than say those back in the 70's. hey say if u had an old tank in the shed and has'nt been used in months, if u filled it up with water again is it true that where all that dry time that the silicone could come away causing tank to fall apart? some say tanks last longer if always wet.