On the emergency scene, concentrates of a similar type from different manufacturers may be:

The correct choice reflects a practice that is crucial for maintaining the effectiveness and safety of firefighting agents used by airport emergency responders. Mixing concentrates of a similar type from different manufacturers immediately before application can be advantageous because these concentrates are often designed to have compatible chemical properties that work synergistically, enhancing their intended effect against specific types of fires.

Using concentrates from different manufacturers, when they are of the same type, can maximize foam or extinguishing agent performance. This practice allows for flexibility on the emergency scene, especially when resources may be limited or when specific products are not readily available. However, it is important to note that this should only be done if there is prior verification or established guidelines indicating that those products are indeed compatible.

In contrast, storing separates when different concentrates may not recognize the advantages of their compatibility. Testing is typically required for new mixes to ensure that they deliver the expected results, which makes the use of tested concentrates crucial in firefighting operations. Discarding mixed concentrates can lead to unnecessary waste and loss of valuable firefighting resources.

In summary, the response signifies an understanding of the adaptability required in emergency situations while reinforcing the importance of confirming compatibilities for effective firefighting efforts.