Another way of saying that 'the effect of A to B is double-edged'?

I am writing an essay describing the effect of water to aerosol scattering coefficients.

Water will increase the size of particles, thus increase scattering coefficients; while it may also reduce the refractive index which could decrease scattering coefficients. I want to summarize this phenomenon as:

The effect of water to aerosol scattering coefficients is dual-edged.

I am not sure whether the word 'dual-edged' is used correctly and particularly looking for a properer replacement.

What would be a nicer way of saying this?

Solution 1:

Water can have two opposite effects on aerosol scattering coefficient. While it increases the size...

Water has two different effects on aerosol scattering coefficient, and they are antagonistic. While it...

• antagonistic - mutually opposed, acting in opposition; opposing, esp. mutually.

You could also say that water "has a dual effect"

Solution 2:

The effect of water to aerosol scattering coefficients is twofold.

ADJECTIVE Having two parts or elements

-ODO