Ensure maximum performance of your Alen Paralda air purifier by regularly replacing its filters. The HEPA-Pure-Paralda replacement filter maintains the efficiency of the Alen Paralda air purifier's all-in-one filter. The filter features a two stage filtration process. In addition to the advanced HEPA filtration there is a pre-filter which captures larger particles that could be damaging to the unit. Each filter lasts up to six months with continuous use. Compatible with the Alen Paralda air purifier.