I have been using this seasoned developer for the last year since I moved back to Ontario. I have heard of people using it for years and years. Well, as I near the year end mark, I've noticed a pretty big change in it's character. For one, I have to replenish about 2 litres, dilusion B every time I develop (once a week or once every 2 weeks), where about 2 months ago, I would have the same time and results as 2 weeks prior without any replenishing. I've also noticed it's much darker, almost black and I'm developing at 16 minutes to get the results of 10 minutes from a couple months ago...even after replenishing. Even then, my highlights aren't hitting how they used to I'm not sure if it's contaminated, but I don't see how it could be. The only thing I can think of that changed is that I had a large supply of natural spring water for replenishing. Well I got backlogged and ran out of spring water and was in a big rush, so I used regular tap water from the well a couple months ago....when everything started to go in it. So, I just ordered two new bottles of HC-110 and I'm wondering if I should just start over and cut my losses, or replenish something like half of it. Also, anyone know what would cause such a rapid depletion of such a stable seasoned developer? I have lids for my 10 Gal tanks that I use and never had a problem with such rapid depletion before. My workflow stayed the same, kept everything clean. But I did filter it out once in coffee filters because residue that would stick to my film...but it worked fine for a couple weeks after that at the same speed...had good colour and everything. I don't think the two litres of normal tap water would do anything, would it? I'm siding with just starting over, but as you seasoned developer users know, it's a hard conclusion to come to.