engineering recuitment PPSC JE Civil Mock Test 2022 Environmental Engineering Water Supply

The period of cleaning of slow sand filter is usually:

1
30 days to 90 days
2
120 days to 180 days
3
90 days to 120 days
4
15 days to 30 days
Share: WhatsApp Telegram X

Sponsored

hivanix.in

Visit

This quiz is brought to you by hivanix.in

🌐 Web App Development

Other Tools: chatwiz.hivanix.in mmspace.hivanix.in unogame.hivanix.in

Quick Navigation

Home

Subjects

Chapters