how much I O per gal to do water change

[no1bubba]

How much I.O. per gal do I use for a 20% water change

 

[panmanmatt]

Same amount you use per gallon when you first made the water for the tank. IIRC IO suggest 1/2 cup of salt/gallon

 

[Witfull]

always mix,,,,test,,,,wait,,,,test again.

your milage may vary~

 

[lcstorc]

Roughly 1/2 cup per gallon but always go with less and like Dave said. Mix, test mix.
You should always let the NSW mix for 24hrs to make sure it is well mixed and aerated.

 

[coleBB]

i use 1/2 c. per gallon...............anyone had low ph in mix with IO or reef crystals??

 

[JWarren]

Weighing is more accurate.

653g to 5 gallons of Ro/Di will get you 1.024sg. (my results. Your results may vary)

130.6g per gallon.

 

[greencamaroz28]

So thats 4.66 ounces . a little over a half cup since a half cup in 4 ounces .


jwarren i have a postal scale that is good for 0.00 ounces .( hence i could wieght it out to 4.66 ounces ) do you think i could use this instead of a gram scale ?

 

[JWarren]

I use a pelouze postal scale that has grams, which is more accurate for this scale.

You could measure out to 4.66, that's pretty accurate. Mix up a gallon and test it to be sure.

 

[greencamaroz28]

cool i see if my scale does grams too ? and ya it might not be excatly the same amount for me .

 

[lcstorc]

You still want to test regardless. Different batches can be different and if you don't test you won't know. A refract is a good way to get accurate results for very little cost.

 

[JWarren]

Lynn, that is the problem with using a cup to measure solids, cups are only good for measuring liquids. Always weigh solids and you will find that will hit the mark more frequent with the SG.

I have always weighed my salt and it comes out pretty consistant. I always test every batch, cause I have not been real impressed with IO the past couple of years.

I did a test with a friend that lives in North Dakota, in the mountains. He used my recipe for saltwater and came out at 1.021 consistantly. The only thing we could figure was altitude. I have tried to check this with others, but they had no idea what their altitude was.