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Water freezes at: 0 degrees Celsius (0° C) 32 degrees Fahrenheit (32 °F) 491.67 degrees Rankine (491.67 °R) 150 degrees Delisle (150 °De) 0 degrees Newton (0 °N) 0 degrees Réaumur (0 °Ré) 7.5 degrees Rømer (7.5 °Rø)
Restate the question: triangle QRS is similar to triangle DEF ..... (If this isn't your question, then change the wording and ask it again) Then (QR/DE) = (RS/EF) = (SQ/FD)
You add diatomaceous earth (de) powder to a pool based on the size of the filter. Most pool filters have a plate on the side telling you how much de powder you need to add. If your filter does not have such a plate, the general formula is that you add 1 lb. of de powder for every 10 sq. ft. of filter area. That is, you need to measure the length, width, of your filter, taking the pleats into account, and use the formula "sq. ft. = length x width" to determine the square footage of your filter.
de means of in spanish