Hey,So, I know just changing a bag is just a matter of changing the bag, making sure it's compatible with the primary fluid, and programming the pump. But, if you are setting up a secondary; is it okay to prime the primary line first and then, prime the secondary/piggyback (the same way as the first) and just attach it? I could never get backpriming; priming each just makes more sense to me. Then, program your primary, then secondary and open both roller clamps. Oh, and let me clarify; I am not speaking of blood (I know you have to close the NS clamp to infuse the blood), I am talking more of like antibiotics.