[delta66]

Παρων.

Η (θεωρητικη) αποψη μου, ειναι οτι η παροχη διοξειδιου δεν θα επηρεασει το τεστ της KH και αυτο γιατι τα τεστ KH στην πραγματικοτητα μετρανε alkalinity και προσθετωντας διοξειδιο, προσθετουμε ιση ποσοτητα H+ and HCO3- με αποτελεσμα να "αλληλοακυρωνονται".

Κατι αλλο συμβαινει και εχει πτωση σε GH KH
Εχει τυρφη? πολλα ξυλα? ξερα φυλλα πχ catappa? πολλα σαλικαρια? μιξη με ΑΟ?


What most people don’t realise is that the aquarium KH test kits don’t actually measure KH, but Alkalinity instead. Alkalinity has nothing to do with water hardness but is the buffering capacity of the water defined as the capability to neutralize H+ ions. This Alkalinity can come from many different compounds, but carbonate alkalinity tends to make up most of the alkalinity in our tanks. Other compounds that can contribute to alkalinity are phosphate, nitrate and silicates just to name a few.

Adding CO2 to the tank doesn't affect alkalinity (or KH test kits) at all. This is because equal amounts of H+ and HCO3- are formed so in affect cancelling themselves out. http://www.jsctech.co.uk/theplantedtank/water.htm


Addition of CO2

The addition (or removal) of CO2 to a solution does not change the alkalinity. This is because the net reaction produces the same number of equivalents of positively contributing species (H+) as negative contributing species (HCO3- and/or CO3--).
http://en.wikipedia.org/wiki/Alkalinity#Addition_of_CO2