英文别名AQUANAL(R)-PLUS PERMANENT HARDNESS; AQUANAL(R)-PLUS TOTAL HARDNESS; BETZ 0290; TOTAL HARDNESS INDICATOR; TOTAL HARDNESS INDICATOR TABLETS; AQUANAL(R)-plus total hardness 1 drop 1 German degree of hardness (0.178 mmol/L Ca); AQUANAL(R)-plus permanent hardness 1 drop = 0.01 German degree of hardness (0.00178 mmol/L Ca) 
