PDA

View Full Version : mixing two part into saltwater


flyyyguy
10/18/2009, 05:32 PM
ok...im not asking nearly as silly as a question as the title may imply......

but I am genuinely curious for those in the know. Does it matter to any relevant degree if the water I make my two part up in is say...... .001-.003 salinity??

I ask because I have done this before, and sometimes I dont fully empty out my water bucket with new asw before filling with fresh, and if in a hurry I sometimes will have some salt in the water I use to make more two part up with.

what do you think?? Irrelevant at that low??

Randy Holmes-Farley
10/18/2009, 05:40 PM
A minor difference.

In the alkalinity part, you'll precipitate magnesium hydroxide and calcium carbonate. At sg = 0.003 (about 11% of NSW salinity) there's maybe 150 ppm of magnesium = 6 meq/L. That will cut down only a little (12 meq/L) on the total alkalinity present (which is about 1,900 meq/L). The calcium effect is even smaller.

The effect on the calcium part will be negligible.