Riemann P20 Sunfilter is a well tried and tested product to protect from sunburn while allowing a gentle, slow golden tan. Get prepared for when the sun does shine with this exceptional sunfilter that offers so many benefits compared to other sun creams and lotions. Riemann P20 Sun Filter SPF20 is perfect for people who like swimming in the Sunshine, P20 Sunfilter is simply not like any other product. It is a unique product as it is active 15 minutes after application so you can simply get on with enjoying yourself while protected from the sun. (Easy-to-follow instructions are pr d with each bottle). Riemann P20 Once-a-Day Sunfilter pr s high sun protection - factor 20 - and is still 90% effective after swimming. P20 has been proven in the scorching Saharan sun and many other extreme conditions.