Water filtering devices, namely, water purification units for waste water treatment consisting of perforated non-metallic waste pipe with multiple layers thereon which has been treated with bacteria and/or microbes for use in waste water and septic waste treatment and which are useable and functional when placed inground; Waste water and storm water pipes being parts of sanitary facilities; Water filtering device, namely, a layer of randomly-oriented fibers for use in substantially surrounding a non-metallic waste water pipe