Average system costs = $95 per square foot. Average solar panel output = 10.6 watts per square foot. Average solar energy system costs = $8.95 per watt. In order to compare the solar energy costs to conventional hydrocarbon fuels, we must covert the $8.95 per into KWH.ince coal, oil, and gas can be measured on a cost per KWH, we should measure solar costs on a KWH basis. Some of the considerations for a solar energy system include the 20-to-30 year lifespan of the system and the hours of available sunlight.
Backwash until the water runs clear out the waste line. Usually about 2 - 3 minutes. You may need to add water to the pool before or after backwashing. On a D.E. filter, the last step is to add the fresh D.E. powder to the filter, through the skimmer. Also effective with D.E. filters is to backwash 2 or 3 times, for a total of 5 mins. Backwash for 2.5 mins, filter for 20 secs, Backwash for 1.5 mins, filter for 20 secs, Backwash for 1 minute, then back to the filter position. This removes more DE powder than just a single backwashing.
If you are sure that your pool has some stain issues, what you do is to drain your pool at least halfway and refill it with treated water (softened water). Let this water circulate for about 2 days and have it tested the second time around for traces of metal components.