Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by Randy Holmes-Farley, Dec 17, 2017.
Don’t want to throw anything off over a misinterpretation
Maybe start slow by making the same concentration as you use now.
Let us know how it works out.
can Somebody recommend a good scale and where I can get the chemicals for the calcium and magnesium solution?
Can't comment on the scale, but calcium and magnesium chloride are available from BRS.
Randy, I have 2 questions
1. As I use anhydrous CaCl2 should the 20% reduction in volume be applied as in Recipe-1...?
2. I almost never need to dose the Mg part of the standard recipe-1 as I never see my Mg below 1350 and usually more like 1450 ... I put this down to my NSW water changes but for whatever reason it appears I rarely need to dose Mg. Can I just omit it from the Calcium part of the new recipe...? or would that have other implications.
Yes to the anhydrous.
I'd personally add the magnesium and then not worry or measure it for a long time. It will add very little, and really shouldn't cause magnesium to rise substantially. I think the risk of overdose is super low. People using commercial two parts with the magneisum in it do not see overdoses.
Also, many people have faulty readings on magnesium kits. If you do not add any and use NSW, I cannot; see how it would ever get to 1450 ppm unless the salinity was very high.
That said, you could leave it out if you really want.
Starting the NaOH version today. My starting parameters are
Dosing Alk part 38mls day , Ca part 43 mls day
Readings (both Hanna eggs)
and pH is 8.0 on my meter with no CO2 scrubbing in place
See what happens, starting with no change to dosing regime but new mixes.
Thanks..got that..will put the Mg part in and measure in a month.
Great. Looking forward to the results.
So I mixed up the Sodium Hydroxide version at 3x the recipe above (for twice the concentration of ESV). Here are a few quick notes from my kitchen.
1. Most of these chemicals get really hot when they react with water. I sort of remembered this but was still surprised by how hot. Be patient.
2. There’s a lot of solids going into the Cal/Mag mix. Don’t start with too much water.
3. At this concentration the Cal/May mix is getting fairly opaque. It’s still surprising how much water can dissolve.
4. A drop of the alk mix turned gellike when it hit the water but as soon as it found some movement it appeared to dissolve completely.
Thanks again Randy! If this works out the reduced volume required will be a blessing given that I have a fairly small, hard to access space for my two part reservoir (now three part).
Great update! Thanks.
Actually, I have just dumped my Mag test kit and bought a new one (Salifert) and it tests 1150 repeatable. You were saying..?
Would it be alright to substitute Epsom salts in the place of the Mag. Chloride hexahydrate? In researching this, seems like the difference is a couple of molecules of water. My Magnesium normally stays above 1400, so I am considering just leaving the Magnesium out.
Epsom salt is magnesium sulfate, not magnesium chloride.
I understand that one is Sulfate and one is chloride. Being adding the Magnesium is not required, can Epsom salt be substituted for the chloride. Didn't want to buy other chemicals if I didn't need to.
You cannot mix magnesium sulfate (Epsom salt) in with the calcium part, because insoluble calcium sulfate will precipitate out if you do.
You cannot make an exactly balanced two part using Epsom salt only as it may be a little heavy on sulfate. But you can make a usable two/three part (not yet modified for hydroxide):
Aquarium Chemistry: A Homemade Two-Part Calcium And Alkalinity Additive System ? Advanced Aquarist | Aquarist Magazine and Blog
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