What type of salt are you using?
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I have only used a total of 2 boxes of HW Marine Mix.
First box mixed wonderfully...it was loose grain. My second box was a brick and I had to chisel it a bit and remix it. That second box mixed terribly...it would take about 3x the amount of time to mix up 15 gallons using the same powerhead and I would have to hand mix a portion of it.
That could be your issue as well.
unless the salt is pure synthetic, most of them use anti-binding agents to keep the salt from clumping. This plus other forms of mineral impurities in natural salt sources will result in this type of residue.
From my experience, IO is the worst offender. They use some serious anti-clumping agents that over time leaves a nasty dark paste in the mixing container and all the associated equipment.
I have since switched to completely synthetic salts.
HW is purely synthetic without the binding agents. It's advertised as so saying it won't leave the residue. One of the reasons I tried this Salt.
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guess they lied about the residue. go figurethats why i just use cheap io. feel those more expensive salts are all talk. i changed salts several times never noticed a difference in my tanks, so why not go with the cheapest
hey where on long island are you. i used an expensive salt (wont name it) and it was fine then had a bad batch. i was like to the sale rep at manca, why am i paying more if i can bad batches. like its a crap shoot