If you are doing C41, the dev mixing with an acidic stop or the bleach generated a LOT of CO2 gas, more than enough to pop a sealed lid off a tank.
Even garden variety fixer like Ilford Hypam tends to want to release some gas.
And David, a $20.00 tank is a cheap one indeed!
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
Try Durst tanks. Mine leaks not a drop but filling and emptying takes a little longer than my Jobos which with vigorous inversion will leak slightly but not enough to make a difference to the safety margin that Jobo builds in when it tells you to use 240 mls for 35mm and I fill to 250 mls becasue it is an easier number
It took me a while to get used to the stainless steel reels and tanks. Now that I am I like them so much better than using plastic because:
1-Now that I have the hang of it, I can load the SS reels faster and more easily than the plastic. I've also never had a steel reel pop open and spring the film loose
2-Since I started processing C-41, the temperature control of the steel is very convenient.
3-They use less chemical (580 ml in the Paterson vs. 440 ml in the SS for 2 35mm rolls)
4-The steel reels and tanks are easier to dry and can still be used without trouble even if not perfectly dry. Not so the plastic.
I have a single real SS tank that does not leak, although the steel cap is sometimes a challenge to get off in time critical spots when changing chemicals.
The plastic lid on my double reel SS tank has a crack in it and leaks, does anyone know if these can be replaced?