best product to dose calc

[rusty18]

I wanted to get some feed back on the best/cheapest (any grocery store products?) to use to dose manually for calcium. Also I want to add a clam or 2 in the near future I have about 100gal in the total system.

 

[reefsmurf]

Dripping kalk is the cheapest I believe, followed by Randy's two part formula. I think Calc reactor is third. Search for Randy calcium on google. With clams you might need kalk + 2part.. or just get a calc reactor.

 

[stevenp]

Dowflake (driveway salt). It's pure calcium chloride, however; it's tough to find this time of year.