It seems like you're referring to a scenario involving a mixture of mortar and water, where you want to separate the settled mortar from the water in order to use the water for irrigation. If the mortar has settled at the bottom, pouring the clear water from the top onto the grass is generally harmless if the following conditions are met:
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Composition of Mortar: Ensure that the mortar used does not contain any hazardous materials or chemicals that could leach into the water. Most standard mortar formulas are non-toxic once cured, but fresh mortar can contain substances that may be harmful.
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Dilution: If the water is purely clear and there are no floating particles or signs of unreacted cement, it’s less likely to be harmful. However, if there are any remnants of the mortar, it’s best to avoid using it.
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Amount Used: If you're only pouring a small amount of water, the potential impact on soil and grass will likely be negligible; however, if a large volume of water with any contaminants is poured, it could affect soil health.
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Local Regulations: Check local guidelines or recommendations regarding the disposal of construction materials, as there may be specific regulations about how to handle and discard mixtures that may impact the environment.
In summary, if you're certain that the water is clean and free from harmful materials, it should generally be safe to use for watering grass. Always use caution and consider conducting a small test if you're unsure.