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Kevlar fabrics or aramid fabrics are used when you want high impact resistance that is not possible with fibreglass reinforcement. Kevlar is a brand name commonly used instead of aramid fibre. for more info, see: https://www.v-sure.eu/en/products/fibre-reinforcement/

A germ filter is a filter used to purify water in ponds and swimming pools. Kiesel filters, sponge filters or filter cloths have such coarse openings that the fine turbidifying dust particles pass through them. These so-called coarse filters can only become effective in combination with flocculants (such as aluminium sulphate). These flocculants are shaken into the water and cause the fine turbidifying particles to coalesce into larger clumps so that they can be collected. To filter the finest particles, one should use a diatomaceous earth filter.

The kieselguhr filter is a filter that can filter the finest particles in the water. The so-called coarse filters, which work with pebbles or plastic sponges, can only become effective in connection with flocculants (such as aluminium sulphate). These flocculants are shaken into the water and cause the fine turbidifying particles to coalesce into larger clumps so that they can be collected. Unfortunately, this is not always completely successful, so crystal clear water can only be achieved with diatomaceous earth filters. Kieselguhr is the finest filter material that traps very fine turbidity particles.