PO4 is to low

[Randy Holmes-Farley Verified Community Expert]

If you click on that MQ300 link, what does it say?

 

[Jorge Frazoa]

If you click on that MQ300 link, what does it say?

Say this:

 

[Jorge Frazoa]

Good morning

Randy, I found these two phosphates on Ebay, and they ship to Portugal.
In your opinion what is the best option?

Trisodium Phosphate* Anhydrous

Trisodium Phosphate * Sodium * Anhydrous Powder * Pure Grade * Na3PO4 | eBay

Find many great new & used options and get the best deals for Trisodium Phosphate * Sodium * Anhydrous Powder * Pure Grade * Na3PO4 at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Trisodium Phosphate Dodecahydrate

100g Trisodium phosphate dodecahydrate, TSP, >99.5% | eBay

Find many great new & used options and get the best deals for 100g Trisodium phosphate dodecahydrate, TSP, >99.5% at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Thanks

 

[Jorge Frazoa]

I need your help again.
After dosing 0.24ppm of po4 per day I finally got readings on Hanna. I'm at 0.07ppm.
What is your advice, did you reduce the daily dose or did you monitor it and see if you learned more or stabilized?

 

[Jorge Frazoa]

I need your help again.
After dosing 0.24ppm of po4 per day I finally got readings on Hanna. I'm at 0.07ppm.
What is your advice, did you reduce the daily dose or did you monitor it and see if you learned more or stabilized?

Good afternoon

Today I measured again and the PO4 rose to 0.09ppm. I am on receipt that you are dosing too much. Do we recommend decreasing the dose daily?



thank you

 

[Randy Holmes-Farley Verified Community Expert]

I’d decrease the daily dose, but keep dosing.

 

[Jorge Frazoa]

I’d decrease the daily dose, but keep dosing.

Thanks, Randy

 

[Uncle99]

Good afternoon

Today I measured again and the PO4 rose to 0.09ppm. I am on receipt that you are dosing too much. Do we recommend decreasing the dose daily?



thank you

That’s a good number, dose to maintain stability, on or about that value.

 

[Jorge Frazoa]

That’s a good number, dose to maintain stability, on or about that value.

Thanks a lot for the answers.
Yesterday I reduced it from 24ppm/day to 22ppm/day. And, in 24 hours, it went from 0.09 to 0.08. I think I may have found the approximate daily dosage to keep po4 at these values.
Now what's worrying me is No3. I have No3 at 38ppm. I am dosing a bit of carbon source and I added a refuge with chateo two weeks ago. I hope that with this increase in po4 I can bring No3 down.