Ca regula generala, nu ar trebui sa exista niciun fel de metal in acvariu sau iaz. Foarte multe metale au capacitatea de a elibera ioni de metal (particule incarcate) in apa, care au un efect toxic asupra nevertebratelor, pestilor si microorganismelor. Cu cat este mai acetica apa (pH mai mic decat 7), cu atat este mai mare procentajul de ioni de metal dizolvati in apa. O situatie extrema are loc atunci cand ploua (ploaie acida) si apa de ploaie este colectata in jgheaburi si folosita: pHul mic al ploii de apa poate dizolva cantitati mari de ioni de cupru din jgheaburile care sunt facute in general din cupru, ducand astfel la simptome de otravire. Folosirea unui conditioner bun al apei duce la legarea (chelarea) ionilor de metal. Daca sunt observate simptome de otravire, o schimbare a apei este necesara. Aveti grija cu apa de la robinet deoarece aceasta contine fier, cupru sau zinc (din tevi). De aceea, este esential sa folositi un conditioner bun al apei cand schimbati apa. Folosirea boilerelor cu apa fierbinete poate cauza de asemenea probleme.
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