Jag använde Varitab förra året och tycker som flerar andra att det var riktigt bra.
Som jag tolkar det så är det blå snabblösande till för att chock klorera sandfiltret och döda alla ev bakterier där.
*klippt från tillverkare*
http://www.bayrol.com/products/comfort-care/disinfection-plus/varitab/Varitab® is a 300 g multi-functional chlorine tablet consisting of two layers with the following properties:
shock disinfection of the sand filter, continuous disinfection to eliminate bacteria and turbidity in the pool water, flocculation, hardness and chlorine stabilisation.
The two layers of Varitab® work in different modes of action:
The blue part disintegrates within approx. 10 minutes and remains on the filter bed. With the circulation pump running, this granular dissolves slowly, and carries out an intensive disinfection of the filter material for about 30 minutes, safely removing dirt and bacteria.
The white part of the tablet is slow dissolving and provides a continuous disinfection.