1.   Usually the surface requires some preparation, often etching, to receive and retain the precipitate.

2.   But stone surfaces require sealing.

3.   Gossage said he has been assured by engineers that the new asphalt surface will not require any curing time.

4.   He said the surfaces would require periodic washing to remove dead bacteria that float out of the air and land on the killing surface.

5.   Surfaces still would require periodic washing to remove dead bacteria that float out of the air and land on the killing surface.

6.   Tiller said the surfaces would require periodic washing to remove dead bacteria that float out of the air and land on the killing surface.

7.   Gullikson noted that temporary clay surfaces require some time to settle.