I have been reading about the many algae problems with wedding cake steps. I can only assume the algae problem is either caused by stagnate water under the stairs, or the chlorine never makes it behind the stairs (again we're back to the stagnate water issue). While I may change my mind at some point...I really want to use these steps rather than a ladder type arrangement. I have had some rambling thoughts and would like some input regarding this issue.
I was thinking about installing a 1000-1500 GPH bilge pump (about 4 amps), 12 volt powered by a deep cycle marine battery. It would be suspended about midway under the stairs, closer to the steps with a discharge hose points in the direction of the usual pool flow. A small solar panel would be used to keep the battery charged and a timer to allow it to run a couple of hours each night. I would think that since the water is being exchanged (2000 to 3000 gallons in a two hour cycle), it would greatly reduce the potential for the water to sit stagnate under the steps. If this works it would be virtually maintenance free and no additional electrical costs.