Quote Originally Posted by the image reaper
your pH is rising primarily from the buffering effects of the rockwool and hydroton ... you have to pre-soak rockwool for a few days before using it, to allow it's pH to settle ... hydroton also contributes alkalinity ... I try to take advantage of the pH rise, by being able to run a little 'hotter' nute feeding :jointsmile:
IR hit it: your grow media is most likely causing the fluctuation. Throw your media into a bubble bucket with some pH'ed (5.6-5.8) nutrient solution and let it bubble out. Use a weak nutrient solution (like 10-25% of full strength) and check the pH every few hours. When you go a day without the pH rising (or falling) much, you're done.
gainesvillegreen Reviewed by gainesvillegreen on . my ph wont stay put For some reason ,my ph in my 10 gallon resevoir wont stay between 5.78 and 6.2.I take it down to the appropiate number,and the next day its right back up to 7.35 or something no where i need it to be.I am using r20 and i make sure the ppms are right in it before i add my nutes.I use less than what the directions say on the back.I have a sumbersable pump that has a T at the end of it so the water is constanly circulating and i have 2 huge airstone that keep it airated.My growing mediums are just Rating: 5