So it a softwood which doesn't treat with resin had to be found, branches as few as possible, or has a high branch distance and is obtained lastingly, too. The suitability for sauna plants on top of everything was required with extreme temperature fluctuations (short heating time).

By Koll's subject competent sawmill staff many different softwoods were cut, dried and the required circuit races taken into account, tested. It was certain middle of 80 years for Koll that the German poplar is the best alternative to the tropics wood Abachi for him. It merely the so-called took effect being. Most poplars, however, aren't suitable for the use of saunas since poplars are at Alleen often. Is frequently this avenue poplars damaged by road salt, also has a very high branch frequency the being, often contains alien elements (staples, nails of poster attachment) and being missing growth shows for the most part.

The woods poplar, one concentrated the purchase for poplar for, this one in this mainly being for whale dinners grows, a good sub-ground and growth and a low branch frequency has. So only tree-trunks took effect from individual reachings for the sauna area. Inspected and select, which one did the woods poplar become already before reaching being to be bought had? The tree reaching is, on thus already natural is ways less humidity in the tree carried out only in the late autumn/winter.

At the drying of the woods poplar many points have to be taken into account and years from the order until use pass in the Koll sauna so.

Many sauna manufacturers shun, for these very expensive proceedings today certainly, too, furthermore these use tropics wood although there are alternatives at technical competence.

Already at the end of 1990 the Munich town council (South Germany) has decided unanimously to use no more tropics wood for municipal buildings to make such a contribution to the protection of the threatened paradises because the wood element is partly responsible for the rapid destruction of the rain forest.

The provincial capital has Munich in cooperation with "Pro Regenwald" (per rain forest) pointed to the alternative in the sauna making already 1993 in an adviser for clients (edition printing 20,000):

Koll has made a name to himself by the high subject competence in the line of business just as a supplier of tropics wood-free sauna plants. Long time experiences having shown just in sauna plants used commercially that the German woods poplar used by Koll can be used considerably longer than Abachi. To this the German woods poplar affects cost-neutrally for the client.