ANSWERS SURE A+
✔✔priming the pump - ✔✔give enough water before starting the pump. Have water
running through at all times
✔✔Turnover rate - ✔✔amount of time it takes for all the water in the pool to go through
the filtration system
swimming pools - 8hrs
wading pools - 2hrs
spas - 30 min
✔✔filters remove - ✔✔remove particulate matter, not microorganisms
✔✔uranine dye - ✔✔is a powder or liquid reagent used to check the circulation
✔✔three types of filters used in the aquatic industry - ✔✔sand, diatamoceous earth and
cartridge
sand filters - can filter particulate matter down to 60 microns.
water comes through the filter influent line (top pipe) and dispersed through the diffuser
evenly distributes the water through the sand bed. sand filter grade #20
laterals are rungs located in the bottom of the filter tank. A broken lateral can allow sand
into the return lines and thus into the pool basin.
✔✔filter run - ✔✔time between backwashing
✔✔Backwashing and why we do it - ✔✔The process of reversing the flow of water back
through the filter media to remove the entrapped solids.
decrease in flow rate
excessive differential on the influent and effluent gauges
✔✔problems in a sand filter from improper backwashing, doing it too often or having an
old filter - ✔✔mudballs, channeling, calcification, crevicing: sand bed shifts to one side
of the tank leacing a vacant area within the filter tank through which some of the pool
water can pass without being properly filtered.
✔✔circular pool capacity - ✔✔diameter x diameter x average depth x 5.9
✔✔children under what age should not use the spa - ✔✔13