Product review (5 stars): These filters work
First, I ordered and received another brand filter and installed it.  It did not work.  It leaked.  I tried reseating it hoping I had done something wrong in the installation process, but it still leaked.  I reinstalled my original filter and it did not leak, so that indicated to me there was something wrong with the replacement filter.  I returned the filter for a refund and then ordered the 2 Park Aquacrest LT700P replacement filters.  I received them two days later and installed one.  No leak.  Works great.