water purification (filter) working model science project - diy - simple and easy | DIY pandit
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Water purification explanation :

1st stage - water is passed through big gravel or stones where it filters the dirt particles and waste materials
2nd stage - water is passed through small gravel or stones where it further filters the dirt particles which are small
3rd stage - water is passed through sand where it further small dirt particles are filtered
4th stage - final stage where water is cleaned using cotton or tissue paper where dirt and waste materials are completely removed using this filtration mechanism