snickle

Is it possible to combine the two solutions?

Add it all to a 2 Liter bottle and top of with distilled and then just dose twice as much?

jon_the_newb

I've forgotten why exactly, but I've seen it said that you should not mix the two. I'm sure someone else can give the specifics, I just remember you're not suppose to. Sorry I don't have the full answer.

Jon

Edward

Mixing macro with trace elements is a bad idea. There are chemical reactions making them unusable.

How many bottles ADA and Seachem make to do the job, PPS-Pro only two …

wintor56

Hi Edward,

Are you able to expand on what these "chemical reactions making them unusable" are?
I have asked this same question ie why they cannot be mixed, before and the answer I got was " it works better ".

Best Regards,
Des.

Edward

wintor56

Edward,

Considering that the complete PPS system including PPS PRO was your invention, I thought it would have been more appropriate for you to have been more forthcoming with the answers and a proper ,logical explanation, to the question asked, instead of asking me to Google for them .............and considering you are a moderator too !!!
I thought that a forum especially one like this was to share information........... Maybe I was wrong.

Des.

Edward

> Both iron (III) and phosphate are pH dependent. Phosphate chemistry
> derives from dissociation of phosphoric acid, a triprotic acid.
> FePO4 (S) _ Fe3+ + PO43- KSO = 10 -26 = [Fe3+][PO4 3-]
> Iron (III) complexation:
> 1. Fe3+ + H2O _ FeOH2+ + H+ K1 = 10 -2.2
>
> 2. FeOH2+ + H2O _ Fe(OH)2+ + H+ K2 = 10 -4.56
>
> 3. Fe(OH)2+ + H2O _ Fe(OH)3 (S) + H+ K3 = 10 2.76
>
> 4. Fe(OH)3 (S) + H2O _ Fe(OH)4- + H+ K4 = 10 -19
> Phosphate chemistry:
>
> 5. H3PO4 _ H2PO4 - + H+ K5 = 10 -2.2
>
> 6. H2PO4 - _ HPO4 2- + H+ K6 = 10 -7
>
> 7. HPO4 2- _ PO4 3- + H+ K7 = 10 -12
> Putting it all together:
> KSO = [Fe3+][PO4 3-] = (a0 [Fe (III)T]) (b3 PT)

> Therefore, the amount of phosphorus that can be present in equilibrium with
> FePO4 (S) at various pH values is:
> … a0 and b3 are functions of pH
> … Fe (III)T is either the maximum soluble concentration or the amount that was
> put into the system, whichever is less.
> Application:
> Phosphates are often a problem in lakes. When phosphates are introduced,
> eutrophication (runaway algae growth), can occur because phosphorous is often
> the limiting nutrient in natural systems. Therefore, there is increased focus
> on phosphorus removal in wastewater treatment processes. One chemical method
> for phosphorus removal is iron addition to form iron-phosphate precipitant,
> which can be removed from the treated wastewater prior to discharge.

http://fins.actwin.com/aquatic-plant.../msg00033.html

Muirner

^^^ I dont get it, but great explination. I really wish i paid more attention in High School Chem HAHA!