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Try using bulkreefsupply for High Purity Anhydrous Calcium Chloride Pellets
http://www.bulkreefsupply.com/Calcium,-Alkalinity-&-Magnesium-Calcium-Chloride/c1_2/p5/One-Galllon-(7-Pounds)-High-Purity-Calcium-Chloride/product_info.html
It takes a lot of MG to make a dent to the number you are shooting for, but once there, it will be easy to maintain.
Once you get there, you will find that you probably only need 15-20 ounces a month to stay there.
Remember you CA reactor job is to keep the CA/ALK levels the same, not to make...
I keep my tank at 79. My sump is in the basement and in the winter the basement is about 55 degrees, and I only keep my house temp at 68.
What I have done that has saved significantly on the heaters running all the time, is in the winter I tape hard styofoam insulation boards around the glass...
Simple test. Unplug the Temp Probe. If the display shows near 20 degree, then the probe has gone bad.
The newer replacement ones ($29) are twice the size and have been encased in Epoxy to make them more durable. Plus they had a bad batch of them last year that all failed within a few months of use.
The problem is the water will take the path of least resistance and go around the bag, unless the the baffles are complete covered in carbon so the water doesn't have anywhere else to go.
If you have a sump, then putting carbon in a reactor with a small pump is the best way to go. If you are using a canister filter, you can put it in one of the layer trays.