have done a few B&W classes at the local JC. they had a full lab with all the chemicals mixed up, making it nice and easy. So its time for me to do it at home and have a few questions regarding using and re-using some of the chemicals. 1) developer. will be using XTOL 1-1 one time use and then dump. this makes sense 1a) Water rinse stop 2) fixer. in the lab we fixed for the required time and then put the fixer back in the 1 gallon container to be re-used for the rest of the class. The lab tech after each class tested to see if it was exhausted or not. My plan is to do a similar thing. use the fixer and then poor back in the gallon container. would this be the right thing to do? or should i split the fixer up into smaller bottles and then re-use a smaller amount while keeping some at full strength. Not sure what to do here 2a) Rinse step 3) Hypo clear/permawash. was the the same thing as the fixer above. wash and then poor back into the gallon container. So same question as with the fixer. keep in gallon size and reuse from that or divide up into smaller sizes. 3a) Final rinse 4) photoflow. such a small dilution that its once and done. So I guess my question really only relates to the fixer and permawash. reuse by poring back into the gallon container or split up. and then how do i determine when the fixer and or permawash is done? I'm sure the answer is obvious but I want to make sure I get it right the first time. Thanks!