| 摘要 |
In treating ice dams, a more aggressive de-icing agent creates an initial breach in the dam, followed by treatment with a less aggressive de-icing agent to maintain and grow the breach. Depending on quantities, and specific materials used, that portion of the ice dam which will be removed may be removed in several hours, several days, or a few weeks, also depending on the aggressiveness of the less aggressive agent. Where moderately aggressive de-icing agent is used as the second step, slow-acting de-icing agent can be applied as a third step. De-icing agents can be applied in any order, so long as the moderately aggressive agent and/or slow acting agent are applied soon enough to avoid re-closure of paths already created. A product combination comprises a very aggressive de-icing agent, a less aggressive agent, and instructions specifying use of both agents to breach and maintain an ice dam.
|
