You will have issues in hydro until you get it figured out. Just the way it is I'm afraid but, we are here to help. Jandre gave you some good information there. You will have issues in hydro until you have it figured out but, we are here to help you get it figured out.
So, with that said let me explain how I clean a system. I have to do this everytime I finish a grow and breakdown the system.
Also understand that I buy H202 in 5 gallon buckets, I also keep 5 to 7 gallon of bleach on hand.
I start filling my bathtub with hot water, while it's filling I had 1/4 gallon of H202 and fill the tub until everything in the tub is covered with water. What do I put in the tub? All my airstones, all hoses and all pumps. I get an extension cord and run all my pumps for a few minutes and then shut them off. I let that sit for half an hour.
I drain the tub and then refill with hot water again and use a 1/4 gallon of bleach. Again, I run each pump a few minutes and let eveything sit for half an hour.
Again, drain everything with hot water and this time add nothing. I rinse everything very well and run each pump for a few minutes. Drain the tub and then I put everything back tpogether.
If it cannot fit into the tub for a soak then I have a spray bottle with a water/bleach mixture and I spray completely and then I wipe everything down. I then do it again but this time with vinegar........................yeah I know, lotsa work but you don't want that shit to be passed on.
Hope this helps!