Although nitrate (NO3) is non-toxic it stunts the growth of fish and plants and leads to the excessive growth of algae in aquariums and ponds. Nitrate is only broken down by bacteria under anaerobic (oxygen-free) conditions. These occur for example in the floor covering material or in the reef rock of saltwater aquariums. Every filter which operates on normal biological principles produces nitrate. The nitrate consumption of plants is often not high enough and nitrate becomes enriched in the water leading to an increase in algae growth. (Source JBL) For fresh- and saltwater with two different colour scales. Colour scale with 11 colours from yellow to orange-red. Measurement range from 1.0 to 240 mg/l nitrate. Laboratory compensation system compensates water discoloration. Includes syringe to measure amount of water.
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