[APD] Re: RO/DI setup vs. CO2 setup

["Tom Wood" <tomwood2 at flash_net>]

"Alkalinity around 80 ppm
Total hardness around 120 ppm.

The numbers are from the tank."

Fill a 'squeaky clean' glass or ceramic cup with water - soap 
residue will affect results. Put it in a safe place where it can 
sit for 24 hours, then run the tests again on pH and KH 
(alkalinity) and GH. That's your true starting point.

"The discus buffer has been used only once to bring the pH down 
to 6.8-7.0."

Yeah, but all that phosphate is still in there, and it's probably 
affecting your KH reading. It is a 'buffer' after all.

"What products are recommended to keep the pH down?"

None. Don't chemically alter the pH with 'products'. Once you 
inject CO2 a side-effect will be a lower pH, probably less than 
7.0 at 20 ppm CO2.

Understand what the tables are telling you:

http://www.thekrib.com/Plants/CO2/kh-ph-co2-chart.html

Noodle around at the Krib and here for more tips:

http://www.sfbaaps.com/

TW 


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