Water purity test. Samples of water being tested for their pH levels. All the samples seen here are alkaline (having a pH greater than 7). This indicates that the samples are of hard water. Hard water contains dissolved minerals of calcium and magnesium. The minerals are harmless,but can cause problems with plumbing | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / MARK SYKES |
Bildgröße: | 3543 px × 5315 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |