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IDHA or IDS
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IDHA or IDS

Tetrasodium iminodisuccinate (also: iminodisuccinate tetrasodium salt or iminodisuccinic acid tetrasodium salt) is a sodium salt of iminodisuccinic acid, which is also known as N-(1,2-dicarboxyethyl)aspartic acid. The salts are called iminodisuccinates (IDS or IDHA).

IDHA is a chelate complexing agent of medium complex stability (10-16) which, as a pentadentate ligand, encloses alkaline earth and polyvalent heavy metal ions with a molecule of water in an octahedral structure.
The IDS-Na4-salt is classified as readily biodegradable according to the OECD methods OECD 302 B (100 % after 28 days) and OECD 301 E (78 % after 28 days).
Of the chelators previously used in aquaristics, only nitrilotriacetic acid (NTA), which is suspected of being carcinogenic, is sufficiently biodegradable under certain conditions.