Originally Posted by AndrewsPistol
I'm pretty new at saltwater but I was told to let the mix sit for 24-36 hours in a bucket (or in my case a large garbage can) with a powerhead. This insures that all the salt has been dissolved and then you should get a truer reading
Agreed. You don't have to have a power head as long as you stir it really good a few times a day. But waiting 24 hours and then testing again is the best bet at getting a proper reading.
Plus... The directions are more of a guide as to how much salt to add. I had to test a few times and add more salt or more RO
before I got the right salinity. Now I buy the natural ocean water from petco. It makes it easier for me.
Also, make sure you rinse your hydrometer before and after each use. When you fill it up, bang it down on a hard surface so there are no air bubbles, and wait probably 2-5 minutes to let the arm settle. I try to keep my salinity at 1.025. That way if the hydrometer is slightly off I have a little wiggle room in the safe salinity zone.