Post your DIY additives here!

[Randy Holmes-Farley Verified Community Expert]

The words I wrote above are correct as written. Note the sentence says NaF, not just F-.

 

[Btloi89]

Be careful with fluoride. It can be fairly toxic.

NaF is 45% fluoride by weight, so to add 1 mg/L to 100 liters takes

(1 mg/L x 100 L ) / 0.45 = 222 mg, or 0.2 grams.

You can dissolve up to about 30 grams in a litter of RO/DI.

If you dissolve 10 grams in 1 L, then it is 10 mg/mL NaF and it takes 22 mL of that solution to boost 100 L by 1 mg/L F.

Randy, Here's the math I'm working with for 1250L system:

(1mg/L x 1250) / 0.45 = 2,777mg or 2.78grams

If I dissolve 10 grams per 1L RODI, what is the math to boost 0.11 mg/L in a 1250L system?

Appreciate it!

 

[KStatefan]

Randy, Here's the math I'm working with for 1250L system:

(1mg/L x 1250) / 0.45 = 2,777mg or 2.78grams

If I dissolve 10 grams per 1L RODI, what is the math to boost 0.11 mg/L in a 1250L system?

Appreciate it!

0.11 mg/L x 1250L = 137.5mg F 135.5 mg F /.45 = 305.5 mg NaF needed to contain 135.5 mg of F

0.3055 gram NaF/ 10 grams x 1000 ml = 30.55 ml of your solution needed to add 0.11 mg/L in 1250 L

 

[Btloi89]

0.11 mg/L x 1250L = 137.5mg F 135.5 mg F /.45 = 305.5 mg NaF needed to contain 135.5 mg of F

0.3055 gram NaF/ 10 grams x 1000 ml = 30.55 ml of your solution needed to add 0.11 mg/L in 1250 L

thank you

 

[Isaac Alves]

Use this calculator, pick the entry for potassium from potassium nitrate, and use 74% of the dosed amount (so 74 mL if it says 100 mL).

James' Planted Tank - Dosing Calculator

For my own curiosity:

• Why do we need to use 74% of the directed dose amount calculated?
• Why does the selection need to be ‘Potassium Nitrate’ for mixing up a solution of potassium chloride?
• What is the ideal way to store the resulting potassium chloride solution?

Thank you

 

[Randy Holmes-Farley Verified Community Expert]

For my own curiosity:

• Why do we need to use 74% of the directed dose amount calculated?
• Why does the selection need to be ‘Potassium Nitrate’ for mixing up a solution of potassium chloride?
• What is the ideal way to store the resulting potassium chloride solution?

Thank you

Both. answers are the same: there is no entry for potassium from potassium chloride, but doing the math I suggests allows use of a different calculator entry.

Potassium chloride lasts forever in any sort of container. :)

 

[Isaac Alves]

Be careful with fluoride. It can be fairly toxic.

NaF is 45% fluoride by weight, so to add 1 mg/L to 100 liters takes

(1 mg/L x 100 L ) / 0.45 = 222 mg, or 0.2 grams.

You can dissolve up to about 30 grams in a litter of RO/DI.

If you dissolve 10 grams in 1 L, then it is 10 mg/mL NaF and it takes 22 mL of that solution to boost 100 L by 1 mg/L F.

How long does NaF take to dissolve in 1L of RODI?

And I used a glass flask on a stirrer, could that cause issues with mix time?

 

[Randy Holmes-Farley Verified Community Expert]

I do not know how long it takes to dissolve NaF, but I would not have thought too long.

How much did you add? Did most dissolve?

If most dissolved and just a bit did not, that latter undissolved stuff may be impurities.

You used RO/DI, right, not tank water?

Glass should be OK.

 

[Isaac Alves]

I do not know how long it takes to dissolve NaF, but I would not have thought too long.

How much did you add? Did most dissolve?

If most dissolved and just a bit did not, that latter undissolved stuff may be impurities.

You used RO/DI, right, not tank water?

Glass should be OK.

10g in 1L of RODI. I think most dissolved but it was still a lot of particulates swirling around after an hour of stirring.

I used Sodium Fluoride, Powder, Laboratory Grade, 100 g sourced from Carolina supply company.

https://www.carolina.com/specialty-chemicals-s/sodium-fluoride-powder-laboratory-grade-100-g/889308.pr

 

[Randy Holmes-Farley Verified Community Expert]

Laboratory grade is not really anything in particular, so it may be impurities, such as calcium fluoride. I'd ignore it.

 

[Cuse89]

Be careful with fluoride. It can be fairly toxic.

NaF is 45% fluoride by weight, so to add 1 mg/L to 100 liters takes

(1 mg/L x 100 L ) / 0.45 = 222 mg, or 0.2 grams.

You can dissolve up to about 30 grams in a litter of RO/DI.

If you dissolve 10 grams in 1 L, then it is 10 mg/mL NaF and it takes 22 mL of that solution to boost 100 L by 1 mg/L F.

Be careful with fluoride. It can be fairly toxic.

NaF is 45% fluoride by weight, so to add 1 mg/L to 100 liters takes

(1 mg/L x 100 L ) / 0.45 = 222 mg, or 0.2 grams.

You can dissolve up to about 30 grams in a litter of RO/DI.

If you dissolve 10 grams in 1 L, then it is 10 mg/mL NaF and it takes 22 mL of that solution to boost 100 L by 1 mg/L F.

Reading through fluoride DIY posts I saw that Fluoride should not be stored in glass containers due to etching. Is there a specific container/storage that is a widely acceptable for fluoride then? TIA!

 

[Randy Holmes-Farley Verified Community Expert]

Reading through fluoride DIY posts I saw that Fluoride should not be stored in glass containers due to etching. Is there a specific container/storage that is a widely acceptable for fluoride then? TIA!

Polyethylene and polypropylene are good.

 

[Cuse89]

Polyethylene and polypropylene are good.

Thank you very much for the quick response! Just had one more thing, with your calculations above is there a manufacture that’s your go to for sourcing the product NaF?

https://www.sigmaaldrich.com/US/en/product/mm/106449?utm_source=google&utm_medium=cpc&utm_campaign=22099353999&utm_content=&gad_source=1&gbraid=0AAAAAD8kLQSAfBY0yq3mhdg5O6ShaHqjd&gclid=CjwKCAiAtsa9BhAKEiwAUZAszRK-GlQqJ5VSHygDU-Fc4GhlCfK2JSSTfsA9T53nJlHTx3pcnm0oMxoCDP0QAvD_BwE

Would this one work?
Sorry to bother just getting ready to order

 

[Randy Holmes-Farley Verified Community Expert]

Thank you very much for the quick response! Just had one more thing, with your calculations above is there a manufacture that’s your go to for sourcing the product NaF?

https://www.sigmaaldrich.com/US/en/product/mm/106449?utm_source=google&utm_medium=cpc&utm_campaign=22099353999&utm_content=&gad_source=1&gbraid=0AAAAAD8kLQSAfBY0yq3mhdg5O6ShaHqjd&gclid=CjwKCAiAtsa9BhAKEiwAUZAszRK-GlQqJ5VSHygDU-Fc4GhlCfK2JSSTfsA9T53nJlHTx3pcnm0oMxoCDP0QAvD_BwE

Would this one work?
Sorry to bother just getting ready to order

That one is certainly good. Loudwolf is used by some folks.

 

[KStatefan]

Thank you very much for the quick response! Just had one more thing, with your calculations above is there a manufacture that’s your go to for sourcing the product NaF?

https://www.sigmaaldrich.com/US/en/product/mm/106449?utm_source=google&utm_medium=cpc&utm_campaign=22099353999&utm_content=&gad_source=1&gbraid=0AAAAAD8kLQSAfBY0yq3mhdg5O6ShaHqjd&gclid=CjwKCAiAtsa9BhAKEiwAUZAszRK-GlQqJ5VSHygDU-Fc4GhlCfK2JSSTfsA9T53nJlHTx3pcnm0oMxoCDP0QAvD_BwE

Would this one work?
Sorry to bother just getting ready to order

Loudwolf is a less expensive option.

 

[USMA36]

Can someone check my math? I’m trying to make a diy cobalt that matches reef moonshine concentration. According to the RM tool 1ML will raise cobalt by .27 ug/L. If I use Cobalt (II) Chloride Hexahydrate CoCl2.6H2O which says it is 24.8% Cobalt by weight. If I dissolve 100mg in 1L. Adding 1ML would boost cobalt by .25 ug/L which would just about match the MS concentration. Is this correct? Are there any downsides to using this form of Cobalt? Any risks? Adding this adds only chloride and cobalt correct?

 

[ravi197699]

Can someone check my math? I’m trying to make a diy cobalt that matches reef moonshine concentration. According to the RM tool 1ML will raise cobalt by .27 ug/L. If I use Cobalt (II) Chloride Hexahydrate CoCl2.6H2O which says it is 24.8% Cobalt by weight. If I dissolve 100mg in 1L. Adding 1ML would boost cobalt by .25 ug/L which would just about match the MS concentration. Is this correct? Are there any downsides to using this form of Cobalt? Any risks? Adding this adds only chloride and cobalt correct?

I use 1.09 g CoCl₂·6H₂O per liter for a Cobalt solution, Randy might confirm on this.

 

[fredward]

@Randy Holmes-Farley , Help please. I am trying to DIY the silicate portion of my captiv8 trace dosing. they use potassium silicate. which I did find one source on amazon from a hydroponics store. they don't specify grade or purity. but they do say its 33.53% K2O, and 53.38% SiO2. Captiv8 says 1 mL per 100 L increases silicon by 0.010 ppm (10 μg/L). Thanks!

If it's about 50% Si and I add 20g of powder to 1L of RODI that would make it 10,000ppm Si right? not sure how to get to the dose from there.

 

[Randy Holmes-Farley Verified Community Expert]

@Randy Holmes-Farley , Help please. I am trying to DIY the silicate portion of my captiv8 trace dosing. they use potassium silicate. which I did find one source on amazon from a hydroponics store. they don't specify grade or purity. but they do say its 33.53% K2O, and 53.38% SiO2. Captiv8 says 1 mL per 100 L increases silicon by 0.010 ppm (10 μg/L). Thanks!

If it's about 50% Si and I add 20g of powder to 1L of RODI that would make it 10,000ppm Si right? not sure how to get to the dose from there.

I cannot see any reason to need potassium silicate. Sodium silicate solution is fine.

But if you can dissolve the potassium material, and if potassium does not rise much, it should be fine.

On the math, Si and SiO2 are different. 53% SiO2 is only 25% Si.

 

[fredward]

I cannot see any reason to need potassium silicate. Sodium silicate solution is fine.

But if you can dissolve the potassium material, and if potassium does not rise much, it should be fine.

On the math, Si and SiO2 are different. 53% SiO2 is only 25% Si.

Only reason I wanted to do the potassium silicate was to keep it the exact same as what captiv8 sells and I am usually a little light on K. I was also thinking about sodium silicate but didn’t want to ask too much at once. Didn’t know if it needed to be potassium based to stay compatible with the rest of the trace solution since they’re all mixed into one solution. but I’m guessing there would be no difference there.
So then if doing the potassium silicate double the maths would get me close.
What would be an equivilant dose if I did a sodium solution? Using an 40% water glass solution does that mean the Si is about half that? So take 20% of the weight for a given volume and that’s the Si in grams? And is there a difference btw sodium metasilicate and sodium silicate?

Thank you so much for the help. I was never very good at chemistry even though I loved it.