Alright let me try to do this math in my head, btw need the total gallons of your tank, since 100ppm on a 10g tank is a lot less product you need than 100ppm on a 100g tank. (I've been estimating apx 115g with sand and rock between 100 gal main tank, 7 gal fuge and 40 gal sump filled 1/2 way)
The calcium two part runs at 37000 ppm per gallon of mix up. I'm assuming by pump rate you mean how much per minute, so 0.5 ounces per minute. 0.5 was in 10 minutes per the instructions.
If you lose 100ppm of Ca per week, thats that's about 15 ppm per day, so to get that out of you'd need about 1/20th an ounce per gallon of water you have. so if it's a 100g tank that's 5 ounces, and you'd need to run your pumps for 10 minutes.
Ok I think that math is right... I'm a tad out of it now, so I don't promise accuracy, but it looks right.
As to the BRS site saying Leslies had problems, that might be the case, I've never had any issues, however they have an MSDS which must be strictly adhered to (you'll notice a range of numbers for some items too), so I doubt it was a terrible problem. And I doubt BRS has some super quality control over their product, if I had to guess they simply are a repackager of product they buy, so they could very well have problems as well. And yeah, I'd say they threw that out there to pump their product up, just about all businesses do that in some way.
