This seems very expensive and unnecessary. You are paying for more than the 'food' when you get served at a restaurant. This 'convenience' has a cost. I did not see what size that this was but if it is for less than a US Gallon it is expensive, indeed. A nice way to make a handsome profit by taking advantage of the easily intimidated, chemistry-wise.

I buy the 25 gallon size of Flexicolor developer'replenisher for $100 plus $40 shipping from PDISUPPLY.COM. I use regular fixer and for bleach I use potassium ferricyanide. - David Lyga