I'm using blue Planet myself. BlueMax line. Will prob switch to elite next grow. This line is so good. I have barely any residue in my reservoirs. Like. At all. I've pushed the reservoir to almost 3 weeks and there's still no buildup. Every other brand I've ever used has had some Buildup. This stuff dissolves so unbelievably well. I use it in combo with Sensizym from Advanced Nutrients and Rhizo magic Mix or whatever it's called. Trichoderma is known to keep bacteria, mold, and even pests away. And my reservoir just stays clean.
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