HEPA filters are featured on the website HEPAFilters.us. This website defines what HEPA filters are and discusses their history and development. It defines what types of particles HEPA filters capture and offers tips for their use and maintenance. This website includes links to HEPA filter dealers and manufacturers as well as to air purifier suppliers. Electronic air purifiers are sometimes offered as alternatives to HEPA filters.
The focus of the Auto-Air-Filters.com website is automotive air filters and air cleaners. Website visitors can learn about devices that clean and filter air as it passes through an automobile engine's air intake manifold.
Pond supplies are featured on the website PondSupplies.us, which offers tips for designing and installing ponds and water gardens. Supplies such as liners, pumps, and filters are defined and discussed. Links to companies that design garden ponds and sell pond supplies are included. Visitors can learn about garden ponds and various garden pond supplies and equipment such as pumps, liners, lighting and accessories.