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I used the Apex DOS. However I also used the Bubble Magic. I cannot think of a way the Jebao 1 line could contaminate the other. In any case - you said you were done - I would just ask you to make sure that there was contamination - otherwise - depending on your $$$ APEX Dos or Bubble MagicWe have a Jebao doser. At the start I was pretty sure the issues were user error/set up... we had some back siphoning going on that would flood things. Hoses are now out of water and the controller is lifted. Haven't had any issue for probably close to a year.. now it looked like it siphoned again but strangly only between chems - there was no flooding... I don't see how that's possible as I thought all the valves were completely separate but my fuel went into my mag and reef A compartments and my fuel compartment was left full but clear... needless to say I don't want to waste more chemicals and I no longer trust the one we have... I'm curious what doser y'all recommend most?