HELP! CALC REACTOR tuning

[landshark]

PH is too high and has been long time Spoke with a guy from LFS and he said if the stuff measured in the drip cup (effluent?) where probe is placed reads over 6.8 the media is not melting,hence, not releasing calcium,etc..
I've been at ph reading 7.4 - 7.6 for months, yikes!

I need tuning lesson ?

I will be recalibrating my Milwaukee PH controller probe to ensure accurate, but then need the science lesson.

What adjustments am I making to drive the ph down to 6.5-6.8 range ?

More co2 bubbles ?

Why does the output drip count have any relevance ?
Isn't it about what happens in the media chamber between CO2, media and water that counts ?

[crvz]

Two options for lowering the pH in the reactor. Flow rate of water (or drip count) and/or increased CO2 flow (more bubbles per second). When you speed up the flow rate of water, the concentration of CO2 (which is used to drive the pH down) descreases. So to lower the pH, you can slow down the water flow, or increase the CO2 flow.

[Wiskey]

What you want to do is have a PH controller reading the PH inside the Primary reactor chamber,.. then you set the controler to maintain 6.6 or so,.. lower if needed.

That way the water leaving the reactor is saturated with CA/Alk.

Then depending on the demand of your tank you can adjust the drip rate to control how much CA/Alk you need.

Whiseky

[tdwyatt]

Originally Posted by landshark

PH is too high and has been long time Spoke with a guy from LFS and he said if the stuff measured in the drip cup (effluent?) where probe is placed reads over 6.8 the media is not melting,hence, not releasing calcium,etc..
I've been at ph reading 7.4 - 7.6 for months, yikes!

I need tuning lesson ?

I will be recalibrating my Milwaukee PH controller probe to ensure accurate, but then need the science lesson.

What adjustments am I making to drive the ph down to 6.5-6.8 range ?

More co2 bubbles ?

Why does the output drip count have any relevance ?
Isn't it about what happens in the media chamber between CO2, media and water that counts ?

I will post to this tonight or in the morning when I get home, the connection here keeps timing out (and deleting my reponse )

total alkalinity delivery will depend on two variables, alk concentration in the effluent a well as the rate of delivery. Th rate is the effluent drip rate, nd concentration is controlled by the bubble count (or the pH range setting you have when using a controller, as well as whether or not yu hve two columns and the anmount of aragonit you have in the columns).

Ho do you measure the pH in the system?

What is the response your controller's probe had to the borax test?

What is the response of your tank's probe to the borax test and where in the tank is it placed?

Take pix of your setup for the reactor and show detils for where your pH controller probe is placed, please.

What is your delivery rate for the effluent in ml/min?

What is the alklinity of your tank and how did you determine it?

What is the alk of your effluent and how did you determine it?

What is the pH of your effluent nd how did you determine it?

HTH