Randy Holmes-Farley
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My Tank Thread
I had the tube under water myself and found that's when it clogs down pipe or up pipe lol.
I cleaned mine but a few weeks later it was crystallizing again. I just ended up replacing the tube and its been 3 months now with no issue. Using the ecotech versa dose myself and just using clear silicon tube.
My plan is to merge Ro/di top off and AFR in the last inch or so to prevent crystallization due to evaporation or mixing with tank water.