1600ml?
Wow thats a lot. I always thought that when I reach 200-300 ml per day it would be a lot cheaper to use a Ca reactor. As I always feared having a Ca reactor running while on travel I always thought I would get an undersized one and supplement with 2 part or Kalk.
Care to share why yo uchose to continue with 2 parts alone?
250 grams of dowflake per gallon
1250 grams of dowflake per 5 gallons (2.75 pounds of dowflake in 5 gallons of mixture)
3785ml per gallon
18925ml per 5 gallons
18925ml divided by 1600ml (my usage per day) = about 12 days worth in 5 gallons of mixture
I bought Dowflake at $16 per 50 pounds
50#'s dowflake divided by 2.75#'s = 18.18 (so I can get 18 5gallon mixtures per 50lb bag of dowflake)
So if each 5gallon mixture last me 12 days roughly that is 218 days worth of mixture per 50lb bag.
So I figure with the RO/DI water it takes to mix the dowflake in it costs me about $32 a year for the calcium supplement.
That is not bad IMO.
The Baking Soda is a little more at about $24 per 50lbs. So it is about $50 for a years worth of mixture.
I have used many different calcium reactors over the years with the Schuran Jetstream 2 being the last one I used. This was probably the most efficient reactor I had used and it was still more to run it than the dosing, with the cost of CO2, PH Probes (replaced twice a year), PH controller, calibration fluid for probe, Electricity of the pumps, Media and so on, not to mention the headache of cleaning and calibrating the ph probe ever 3 or 4 weeks. It seemed like I was always adjusting the reactor or the PH probe would go out of calibration or need cleaning and my alk would swing. This does not happen with my 2 part dosing.
With all that said my tank ALK and CAL have never been as stable as they are with 2 Part Dosing.
As long as I have a supply of old style Dowflake ( I bought over 500lbs) I will never go back to a calcium reactor.
As for the Mag supplement I use Mag Pellets by Dead Sea Works and they are about $18 per 50lb bag.