Thank you Lou. 50ml bottles are out everywhere. I’ve tried. I only started with Elimi-NP about 2 weeks ago with little progress so far but to be fair I started at the minimum dosage. I’m assuming I need to add a lot more of the product to get this going. Started a couple of weeks ago at .1 PO4 and today I’m at .16 after adding about 5ml per day. Not quite going in the right direction yet. I have a 400gallon total volume. My NO3 is at 1.2. I’m probably going to increase to around 8ml per day once I can get some more product. I just want enough to get me around .05 or .06 consistently so I can start with Bacto Balance.