Do you test your waterchange water?
 

if so what do you test for?

New salts or if I am having issue.
I was having big three problems while using salinity on several occasions. I tested with CA 590/600, ALK 6.5, MG 1120. No where near analytical

Now back to reefers best

I previously tested both tank and new water for salinity, temperature, CA, ALK and MAG to ensure it's all the same. I'll also make some adjustments at this time to keep everything in the proper range. Now that I've switched to Reefers Best I find it's quite redundant.

I just test if new salt batch is giving me issues

I test the big 3 from the first batch of every new salt bucket, just to see what's up

I always had trouble keeping my alk up. Never really thought of testing my water changes but I have been recently and it was low in the new mixes. So I will always test for now on. I have also switched salts.

I've been having low Alk issues for a while so have been testing first batch made from every bucket. I do 50g changes every 10 days so have to test pretty regularly.

ive been getting the opposite, ive had high alk readings from my salt

+1

+1, and I make sure I roll it tons to make sure it's mixed really well.