Blackwater Home › Forums › European › Methods › Blackwater This topic has 3 replies, 3 voices, and was last updated 9 years, 9 months ago by Jolanda Wisseborn. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts July 25, 2015 at 1:23 pm #8190 Arno BeißnerParticipant Hello Jonette, if you have some carbonate hardeness in the water the ph dont go lower. Use clean rain -water or osmose-water. Greetings Arno July 28, 2015 at 1:31 pm #8197 Jonette StabbertParticipant Thank you, Arno. I am ordering an osmosis unit. Jonette July 31, 2015 at 12:09 am #8207 Jolanda WissebornParticipant Hello there, just entered here and think this site is great. Just like Jonette, I also have a wildtank cycling for 4 weeks, filtering over turf and have catappa and beechleaves. My Ph is normal around 7 and now it’s down to 6.4. My Kh is always low 3. My Gh is gone down from 8 to 4.8. Is it wise to lower till 6? Author Posts Viewing 3 posts - 1 through 3 (of 3 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In