Which would you use to measure how much water is in a pool meters liters or grams?

Grams is a measure of weight so you would not use that. If you measure the depth, width and length of the pool in metres, you will be able to calculate the volume in litres. Every stere (cubic metre) is 1,000 litres.

If you wanted to know the VOLUME of the water, it would be liters. If you wanted to know how deep, use meters- that measures distance. If you wanted to know how much the water weighed, use grams (or kilograms)- which measure weight.

You would use liters to figure out how much water is in a pool.

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