Pool Maintenance - Harare, Zimbabwe

How many litres of paint will be needed to paint a pool 6 meters by 12 meters

I need to create a pool for my house size about 20'sqm roughly how much am I looking at. Not too deep for kids

I am looking for a small swimming pool filter to filter rain water off the roof. The pump capacity is 0.6 bar and the volume is about 1,000 lt. an hour during rain storms. Please can you give me an indication on price and where possible measurements of inlet and outlet fitting sizes.