We recommend that the pool sensor is not to be kept in the swimming pool when the swimming pool is not in use
We recommend that the pool sensor to be removed from the swimming pool when the swimming pool is not in use
The first one is correct. If you want to make the second one make sense, remove "to" We recommend that the pool sensor to be removed from the swimming pool when the swimming pool is not in use.
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The first one is correct. If you want to make the second one make sense, remove "to"
We recommend that the pool sensor to be removed from the swimming pool when the swimming pool is not in use.
We recommend that the pool sensor [not be kept in / be removed from] the swimming pool when the swimming pool is not in use.
CJ
We recommend that the pool sensor should not be kept in the swimming pool when the swimming pool is not in use.
Or
We recommend that the pool sensor should be removed from the swimming pool when the swimming pool is not in use.