Is there limescale in your kettle? If yes you have hard water and should be using ionic hard water grow at the mo and forget the cal mag. if not use ionic soft water and forget the cal mag. ionic likes ph around 6 and i have never needed to add anything else. The sediment is from the hydroton being not washed properly. if the ph is rising and the ec is dropping that is what you want. It means the plant is feeding and disposing waste back into the water. if the ph is dropping and the ec is rising they arent feeding and the water is evaporating. Run the ionic at 3ml per liter to start. If you havent yet had a successful grow in the tent there is a good chance that if it is pvc it is poisoning your plants, this recently happened to me and i couldnt f"in believe it. The 3% h202 from the drugstore has other stuff in it to stablize it that plants dont peticularly like. get some oxy plus and dilute it down before adding it to the system. did you treat the rockwool with ph5.5 water before adding the plants? if not this can cause problems as well. Rockwool will hold water for ages so let it dry out between waterings until you root system can cope. you shouldn't use the britta either, i have never heard anything positive about them for this application use straight tap, let the chlorine evaporate off the ionic should do the rest. I'm in the uk and dont know how many watts a t5 mh??? or a t5 hps??? (I thought t5s were flourescent tubes???) puts out but, 400w absoulte max for small plants. mix up the spectrum a bit, more blue than red for veg. Ionic is a very good one part and when everything else is right you shouldnt need to add anything else except a bit of ph down now and then.

hope this helps :thumbsup:

Subzero.
subzero Reviewed by subzero on . AK-47 in E&F - rockwool/clay medium (First Grow Log) Ok, so this is my first grow log and I'm honestly doing it more for the possibility of getting help when things start turning bad (which they most likely will, because its me). Here's the story, through a vast amount of help from LOC NAR, WeedHound, and Tinytoon I've started some supposed AK-47 seeds I recieved from a friend. I am going to follow these guys advice and see how things turn out this time. This is my fourth grow attempt and the last 3 were utter failures with the plants dying Rating: 5