The answer to your question depends on your specific pool, where you are located, and what type of drain you have. There are specific standards so please check with your local pool professionals for guidance.

Here are a few online resources:

https://www.aquastarpoolproducts.com/draincoverspecifications/1216xxx

https://www.evoqua.com/en/evoqua/products–services/filtration-systems/recirculation-components/main-drains/

https://www.pentair.com/en-us/products/business-industry/commercial-pool-products/commercial-pool-white-goods/starguard_main_drain.html

VGBA