Hi i have been running same op for about 2 years and recently ran into a case of root rot. Saved my crop but its not at all pretty right now. My question is only thing i can see that i havn't been able to clean is a 6 ft run of 1/2"pvc i use for a supply line. I run a chiller and its pretty good at maintaining 67 deg temps up to about 80 degrees room temp. My return water is about .8 degrees warmer then res tank. So i am pretty confident its not an issue with water temps. I have noticed black hydrofarm tubing does not build up salts as much as the pvc does. Does anyone think if i change the supply line to tubing if it will gain more temps vs using the PVC ? my tubes do experiance damming after about 4 weeks but i dont know how i can increase the flow with a root carpet in my tubes. NFT recirculating system thanks for your help !