Salt not disolved

So I had some pre mixed salt water that's been sitting for about a week. I decided to do a water change so I added a power head for 45 minutes to mix the salt and water. Removed old water, added new water and now it looks like snow floating on top. I tried coffee filters to remove the big stuff but it didn't work too well. Any ideas/suggestions for emoval would be great. Thanks!
 
net it off. But the important question---is it undissolved salt? Calcium deposit? Or what?
 
Good article. My PH is on the low side and temperature is between 78,79 and according to that article a higher ph and temperature shouldn't result in the calcium carbonate. But I guess anythings possible. I also have a canister filter with foam pads and chemi pure. Is is possible it's time,to change the carbon ? I was advise to change it every two months or so.
 
both power heads are pointed at the surface to agitate the water and I do not have an overflow box unfortunately :/. maybe Ill just test, wait it out and do a bigger water change this upcoming weekend and see if it dissipates.
 
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