I have been mixing cal mag in a 1 liter capacity spray bottle at the recommended strength with tap water, spraying once a week at night time, and am seeing no improvement to my bubbly curled leaves. I am also liquid feeding cal mag coupled w/ neptune's harvest fish/seaweed 2-3-1 once a week (tap also). I am seeing zero signs of over fertilizing (already been there once this season), rather I am seeing no improvement to what appears to be a bad calcium deficiency - bubbly leaves on my c. chinese, with the the leaves curling upwards onto themselves. I know calcium takes a while to "act," but in the meantime I am considering switching to a bi weekly night time foliar feeding, using diluted water instead of tap, and upping the concentration of the cal mag, and continue the once a week liquid feeding. My other plants are kicking ass and taking names, just my trinidad perfume, datils, and choc habaneros are showing signs of cal deficiency. They are all planted in the same mediums etc etc etc.