Guys :

On my Hatch test kit one drop = to 5 ppm alka. If I put in the 4th drop and the color starts to change but not pink/red but kinda grey and then put in 5 th and it turns to red it means alka. is between 20 and 25. We are in the pine belt and have never had alka. above 40 even with lots of lime. While it would be nice to get to the 200 optimun for LMB it is not practial in $ or space in the ponds. Basic levels -- 200 optimun for LMB ( other sunfish probably close) 20 min. level for fertile pond and/or fert. use. less than 20 not good -- add ag lime. See ranges in links above and posted . ewest