Safe to inject pre-blower on roots type (Eaton MP-62)?

[Dukey]

Is it okay to install a water jet before the supercharger? Seems quite a few people do this, stating it keeps the supercharger from heat soaking, and helps the lobes of the blower seal better, providing more boost. The manufacturer (Magnussen and Eaton) don't seem to recommend it. Anybody here have experience with this? Is it safe for the supercharger?