Well it's been 2 and half weeks I think since I started the MB7. Bought a Hanna to see phosphates were 1.12 but dropping. Noticed the sock needs to be changed every 2 instead of every 3 days now. Much thicker head on the skimmer too. Random green algae I recently acquired seems to be disappearing. Finally got my dosing pumps, hoping to get them on line this weekend.