Math conversion help

[purge43]

My math skills seem to be lacking , maybe due to the loss of brain cells from the 70's, but I had a darn good time. Can someone please convert this to ppm....100 liters with 50mg NO3

 

[disc1]

50 mg / 100L is 0.5mg / L ( 50 / 100 )

That's 0.5 ppm.

 

[disc1]

If you are talking about dissolving a salt, to add nitrate, then the counter ion matters. NaNO3, KNO3, etc.

Dissolving 50mg of NaNO3 into 100L of water would give you 0.36 ppm nitrate.

Dissolving 50mg of KNO3 into 100L of water would give you about 0.3 ppm nitrate.

 

[purge43]

Im researching a sulphur denitrator and the one Im looking at says it will reduce 100 liters of water with 50mg no3 to 0 no3 in 3-4 days. I have a 125g, I do 50% water change every week to get my no3 down to 5ppm. The day before my water change the no3 is 20ppm. From the sound of this Id need 10 or more of these denitrators?

 

[disc1]

Im researching a sulphur denitrator and the one Im looking at says it will reduce 100 liters of water with 50mg no3 to 0 no3 in 3-4 days.

That makes very little sense. Are you sure it just says 50mg and not 50mg/L?

 

[purge43]

see for yourself http://www.marinedepot.com/filters_korallin_biodenitrator-ap.html

 

[disc1]

This piece?

With the build quality of the C-1502 reactor and recirculation, these offer very efficient nitrate removal. After a running in time of approximately 3-4 weeks (for the bacteria to colonize the chamber) this unit will, for example, reduce 100 liters with 50mg NO3 to 0 in 3-4 days.

I bet my bottom dollar that they meant 50mg/L (which is 50ppm). Otherwise, the 100L comment would be completely unnecessary. 50mg of nitrate is 50mg of nitrate no matter how much water it is in.