Can i use this to clear the main drain line in a inground pool?

The product can be used on the drain of an inground pool. It will only work if the obstruction is organic in nature. There could be plastic in the line and it would not clear that. For plastic clogs, we recommend an acid based drain opener or a snake. We would only use it if the pool is currently drained, otherwise it will be difficult to get it to the source of the drain, since it is such a large body of water and it is typically not a steep incline towards the drain like in a sink. Pool drains are typically PVC, so there should be no issue with the plumbing.
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