[ReK]

c'e' anche da dire che sul nitrogen c'e' scrito

Because one-half of the nitrogen in Flourish Nitrogen™ is from nitrate you can get a reasonable estimate of nitrogen levels by doubling a nitrate reading, or, you can use Seachem’s MultiTest: Total Nitrogen™ (coming soon!) to accurately measure total nitrogen while distinguishing between nitrate, ammonia and organic nitrogen.

questo potrebbe essere una delle cause della difficile misurazione coi test