im at 2.2 mls per day at present, still got phos, its not major but its there, im going to keep going till i hit 4 ml, and see how its going then, could be a few more weeks before i hit 4 mil though, just tested ph today actually, it was 8.1 thats quite good for me its been under 8 for a while now, except when dosing kalk, ive had to stop doing that as calcium levels were getting high, im thinking of changing salts to a lower calcium salt then i can dose kalk to aid the ph, i know when the springs here the windows will be open and more oxygen in the house and the ph will be at 8.2-8.3 again, theres too much carbon dioxide in the house due to the heating on at the moment