Hi i have started 2 auto-flowering plants and have had sum real trouble with PH, I am cumming upto the flowering stage and i really need help with my PH. I have been growing my plants on god knows what PH and they seem ok but yellow leaves and few little problems like that which i have managed to sort out but i need perfect PH for my flowering stage. The problem is i have been playing about with PH for over a week and when i test it its always either Yellow (bright) or Red (pinkish colour) i dont kno if i need more or less of things.

Any help is much appreciated.

fill a gallon bucket with normal tap water which is ph 7.6
then add ph down or lemon juice till it comes in at 6.4 6.8

Thanks will try now

iv just bought my self a brita water filter and all i do is fill it up at night and by morning its all filtered and when i check it its about 6

Can any1 tell me why my PH color would be red tho?

accidic.. to accidic!!

Should i try gettin my ph up then cus its red when i added phosphoric acid

yea bring it up a bit mate,,
baking soda or ph up

Thanks mate been a real help.

You should usually see yellow in the ideal ranges...if you are getting green to blue, then your ph is too high....orange to red and it is too low.
Personally, I use Lemon Juice to lower my ph and Baking Soda to bring it up.
Just add little bits at a time, mix it in, wait a minute or two and check it again until you are satisfied.