Deb, ok you are right we are going in circles. It is not my equation it is the standard way by most everyone in the pond industry. I use the same method to get the alkalinty and hardness, excpet I use a more expensive digitial titrator and can read direct results directly or use a calcualtion to get true ppm (or mg/l) Total Hardness. The formula you are using is based on the same thing, if not why do you come up with a completely differnt chart than anyone to send out to clients with the water quality report. They ssume it is total hardness and recommmend 120 when eveyrone else recommends 20ppm.
This makes me (and others in the know)wary when I see this so if it is different look into the calcualtion and see what you recommend for total hardness not some equation diff than everyone else.
On my example I did use the right price just went ahead and did the math 10 bags x $12.95, for 1 acre pond to raise to 120, get it.
Ok, on to major difference in opinion yes I did not figure out way to get around the rain dilution, it was taught in class. It is called agricultural lime. When done properly at 4 tons/acre you can get 4-6 years without having to add other chemicals to raise the level to above recommend level of 20 ppm. However the water quality test suggest to the client not to use ag lime b/c it slow reacting. Correct it is but also slow to be reomved from the pond. Can you see my point and why I get upset when I see the water test? It suggest products that will raise the alkalinity to really high levels but only for a short period of time then guess what they have to buy more. If it is a 0.25 acre pond maybe not a bad idea but with a 2-5 acre pond will cost $1,000's and have clients spend that with you only to have poor water quality when I test the water. Thanks again for your answers.