Nope. Adding sodium bicarb INCREASES the tendency of water to scale. There are various 'saturation' indices that give you some idea whether the water is likely to deposit calcium carbonate (often, the primary component of scale); these indices mathematically combine values for pH + temp + calcium + carbonates (alkalinity). Positive values tend to scale; negative values tend to dissolve calcium carbonate. In all of these indices, the index value INCREASES as any one component value increases.

Bicarb is added to pool and spa waters for 2 reasons: to 'balance' the saturation index, and to stabilize (buffer) the pH. For complex reasons, it does NOT work well for this purpose in heavily aerated spas ( this page explains http://www.poolsolutions.com/gd/lowe...p-by-step.html ).

If you can find it, borax would work better for you. It can help you adjust (raise) pH, buffer pH, and will not be aerated away like carbonates are. Even if not, I would recommend NOT adding bicarb to your pool, unless you have a concrete spa, have accurate test results for pH + temp + hardness + alkalinity, have calculated your S.I., and know you have aggressive water.