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.
5) Pry the tank open from the center with a Flathead screwdriver or small pry bar and remove the filter grids. How To Wash The D.E. Grids & Fingers: Once you have taken apart the filter tank and you have the grids or fingers exposed you will now want to clean them.) Make sure to adjust all your pool chemicals within the proper PPM Range. 2) Make sure to add the proper amount of D.E to the filter system by looking on the side of the pool filter. 3) Make sure you backwash your pool filter at least once a week to keep the filter at itâs best.