PHનો અર્થ શું થાય છે? સાફ અને ચોખ્ખા પાણીમાં PH કેટલું હોવું જોઇએ?
What is the meaning of PH? What should be the PH of clean and clear water?
What is the meaning of PH? What should be the PH of clean and clear water?
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