My 125 gallon reef aquarium is over 6 years and full of mostly SPS corals. I just want to make some comments about NP Bacto Balance. I have been using a lanthanum chloride product to lower my phosphates when they get high, over .17 or so but it would take several test and many days to get the lower reading I want. I think the rocks and sand were leaching PO4 and it would take a long time to get rid of it. Researching on line I found NP Bacto Balance and felt it would do a better job for my tank. I used the Lanthanum C. to lower PO4 below .10 and then started a daily dose of Bacto Balance. I thought I would start slow by using .25 ml /100 liters. After a period of four days my PO4 was .04 ppm . I continued dosing each day and after 5-6 days tested again. I have been dosing for a month now and my readings are stable enough I feel comfortable enough to test one time a month. So far I am very happy with Bacto Balance. According to on line videos Bacto Balance is serving as a carbon dosing product that uses bacteria that corals eat. If so I find this product even more beneficial. I bought a 1000ml bottle and if the dose stays the same it will last 1000 days. I think that is a good deal. I well update if anything changes.