Performance diagram for my DIY Calcium Reactor


On the graph  you can see the capabilities of my DIY Ca reactor to dissolve calcium carbonate and produce alkalinity and calcium.

The graph on the right side presents the capabilities of a calcium reactor measured as upgrading KH liters per hour in relation with reactor settings: outflow and amount of CO2 bubbles.

Upgrading KH liters per hour presents the capability of a calcium reactor to produce alkalinity. 1 KH liter per hour = mEq/h

A calcium reactor may be described as a 'balanced' calcium / alkalinity additive. Basically, this means that it adds calcium and alkalinity to the tank in the same ratio as is used by our corals during the process of calcification. Simply put, it is not possible to change the calcium level without the alkalinity being affected also in a defined manner. [5, Huntington Simon] As an example, for each 1 mEq/L alkalinity (2.8 dKH) the calcium reactor adds 20ppm calcium. If your tank starts out with 3 mEq/L alkalinity (8.4 dKH) and 320 ppm calcium, and you raise the alkalinity to 4 mEq (11.2 dKH) using the calcium reactor, then the calcium level will only increase to 340 ppm! [5, Huntington Simon].

I calculated the upgrading Ca g/day  based on measured Ca in reactor and  aquarium  and I found that my DIY Ca reactor produce  alkalinity and Ca in proportion 1 mEq/L alkalinity (2.8 dKH) ,  20ppm calcium. See also my  excel file. and with orange color marked measured Ca g/day and calculated values.

So, upgrading KH liters per hour presents the capability of a calcium reactor to produce Calcium also . 1 KH liter per hour = 0.171 g/day

Definitions:

Reactor settings:

Two controls are used to adjust a calcium reactor. One controls the effluent, or the amount of water flowing through the reactor, and the other controls the amount of CO2 added to the reactor, usually measured by the number of bubbles of CO2 in the bubble counter.

Outflow: Amount of water leaving the reactor. Measured in ml/min or l/h.

Amount of bubbles: The amount of CO2 added is typically measured in bubbles/min. Unfortunately there is no standard bubble size, so this is a dubious measure when comparing different reactors. In my excel calculation I used  1g = 5000 bubbles.

Measurements:

The following parameters were measured:

- KH  outflow water of the reactor
- KH  aquarium
- PH   outflow water of the reactor
- PH   aquarium
- Ca   outflow water of the reactor
- Ca  aquarium

The Salifert test kit was used for measuring alkalinity (KH) and calcium  of the aquarium water and the outflow water of the reactor.

Calculations:

Upgrading KH: That is the difference between water entering and leaving the reactor concerning its contens of hydrogencarbonate. If there is water of 8  KH in the aquarium and water leaves the reactor with 18  KH, the upgrading is 10KH.

Upgrading KH liters per hour:  This unit is product of the outflow (l/h) und upgrading KH . Upgrading KH liters per hour gives the indication of the capabilities of a calciumreactor.

Upgrading Ca: That is the difference between water entering and leaving the reactor concerning its contens Ca. If there is water of 415 ppm in the aquarium and water leaves the reactor with 450 ppm , the upgrading is 35 ppm.

Upgrading Ca grams per day (g/day):  This unit is product of the outflow (l/h) und upgrading Ca .

Measurements and calculations are submitted in the following excel file.

Literature

  1. Holmes-Farley Randy, Calcium and Alkalinity

  2. Holmes-Farley Randy, Calcium

  3. Holmes-Farley Randy, Alkalinity

  4. Jerina Bojan DIY Ca Reactor

  5. Huntington Simon, A Guide to Using Calcium Reactors

  6. Sanjay Joshi,Calcium Carbonate Reactors