Saltwater mixing---a convenient measure for a 100, 150 tank.

Sk8r

Staff member
RC Mod
I have found a lovely truth about the salt I use. Half a cup to a gallon of ro/di.

Now, how many cups of salt per gallon? 16 cups mixes up 32 gallons, roughly, to 1.024 salinity. And sixteen cups is, yes, a gallon of salt. [yes, there are wet and dry measurements...but it sorta works pretty well as both liquid measures, because salt is more compact than, say, rolled oats.]

In a 44 gallon Rubbermaid Brute (yes, they come in 32/44/55 gallons), this equals an amount of water a hair off the top of the lower set of molded arch patterns. 32 gallons. The problem with the 32 gallon Brute is that it's only 32 when equal to the absolute top, which is just a shade TOO full for safety of anything liquid, re your floors. So I got the 44 Brute, with rolling dolly.

If 32 gallons would be a significant number for your tank's water changes, this might be a good way to go. 32 gallons of water to 1 gallon of reef salt. Check your mixing requirements, get a big barrel, a mixing pump [any pump that moves water well], and figure how much will work with that barrel. Of course check the result with your refractometer, fine-tune it, and mark levels with an indelible marker or tape.

This is a lot like cooking: cups, pints, quarts, gallons. If you're like me, your head swims while counting it out half-cup at a go, and you know the phone will ring or someone will interrupt your count with conversation. This just settles it at one measure.
 
Life is so much easier if you can find something --- an old CD container, a nice saltproof bucket, anything that you can mark. If you can establish both a large-enough water and a large-enough salt measure, in other words, that are known quantities in relation to each other, put A with B and save yourself counting half-cups and losing count.
If you can dump A into B, turn on your mixing pump, and walk away secure in the knowledge it will turn out pretty darned close, you have a lot less work in your enjoyment of the hobby.
 
I use regular IO and 13 cups will make me 1.025 - 1.026 when filling a 32 gallon brute to the lip. I have also marked the inside of the barrel a 5 gallon increments so that if I don't use all of a batch in one WC I can get close to estimating the next batch
 
Mine is a 55g drum. One full bag of IO or IORC + 2 12oz jif jars = 1.025. I rarely even check it afterwards anymore.
 
I've just recently purchased a 32 gal can for my water mixing station. I have been weighing my salt on a kitchen scale trying to fine tune how much salt to use... I figure that is going to be the most precise way to do it but so far ive gone over, under, and anything else but right on. I only have a 40 gal and do 10 gal water changes every 2 weeks so it takes a bit to need to refill the container. lol
 
Weighing your salt is probably going to be inaccurate because of the salts affinity for water. It's ability to absorb moisture from the air can/will change the weight needed. Going by volume will be a easier option for you IMO
 
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