Is it okay to install the Clear O3 vertically? No, the Clear O3 must be installed horizontally and higher than the pool water and pool filter. By paramountpool|2019-01-25T16:22:38+00:00January 25th, 2019|Clear O3|Comments Off on Is it okay to install the Clear O3 vertically? Share This Story, Choose Your Platform! FacebookXRedditLinkedInTumblrPinterestVkEmail