I got a tetenal e6 1L kitt. My previous experiment with the same cheamicals were the 500ml kits and I mixed all the chemicals, stored in the bottles and after using them to develop (since I do 2 films at a time and use 250ml of solution) put it back to the bottles together with other 250ml solution that stayed in the bottles. Should I do the same way with the one litter pack? Or can/should I do only half the working solutions and after 6 films, dump it and do new ones? Or it is best to take always from the stock bottles a determinated quantity for my working solution, 50ml of first dev+200 of water; 50 ml of part one of Color Dev+30 second part+water to 250, etc. And if so, the working solutions are disposed after?