Thus, portraying their acidic, alkaline and neutral nature [67]. Samples E and L recording the highest values are not acceptable for drinking as they are not within 6.5–8.5 (NSDWQ) and 7.0–8.5 (WHO) permissible limits [64]. This may be attributed to underground sulphide mineralization [...
alkaline conditions, acidic conditions, washer conditions, dryer conditions, and temperature extremes of at least from about −5° C. to about 120° C. It is also preferred that the hand-held cleaning device not make excessive noise if placed in the wash cycle and/or drying cycle. This ...