Conduct a technique being used to increase the buffering capacity of granite-based lakes?

Acidified lakes in Sweden may be restored in the short term by liming. This raises the pH of the water through the addition of powdered limestone. Each year thousands of tonnes of limestone are sprayed on Swedish lakes and watercourses, by means of trucks, boats or helicopters. The cost of liming in Sweden in 1992 was 210 million kronor. Liming causes aluminium and other metals to precipitate and fall to the bottom of the lake which may cause toxicity problems for organisms living on the lake bed. Liming provides only a temporary solution, hence it is far better to attack the source of the problem by reducing emissions of acidifying pollutants at the source.