Hsiao Chang wrote:Hi John, there will be a flow meter installed for me, i will adjust the speed accordingly to find the right flow. according to your experience, may i ask how many turnovers do you think appropriate per day for a pool with low batherload please?
Thank you Hsiao, nice to be listened to.
You need to take account of the min flow your heater can have.
From my earlier post I mentioned Gage & Bidwell who mathematically calculated the dilution figure and therefore the filtration level for a given number of passes through a filter.
Teapot wrote: Gage & Bidwell's law of dilution gives us some expectations on how much water actually makes it through the filter. 1st turnover 63%, 2nd 86%, 3rd 95%, 4th 98%, 5th 99% of the water filtered. There are alternatives but they are all pretty close to one another. Personally I am happy with 4 turnovers per day and that fits nicely with the energy usage.
Is the pool outdoors or indoors?
If it's out doors uncovered then the skimmers only work when the pump is running. So when it's not running dirt enters, sinks to the bottom and requires manual removal.
If you run your pump 24hrs per day then the dirt will get collected and water filtered leading to much cleaner water and less chlorine usage. We would all do this if it were cheap enough but we don't because of the expense, you are now in a different league where it might not cost anymore to run for 24 hours. Indoors you may well benefit from less pump run time.
110m3 turned over 4 times like I do, means a flow of 18.33 m3/hour and that is impossible through your filter. Turned over 3 times, means a flow of 13.73m3/h still impossible through your filter. Turned 2 times, means a flow of 9.16m3/h might just be possible through your filter. Hopefully you see why I said add a second filter?
So outdoors or indoors is very important, covered or uncovered.
I see a lot of pools, I have customers, not all take notice of me. One in particular turns over his pool just once a day, he uses more chlorine but it's swimable, not as clear as mine (1.2 NTU's) closer to 9NTU's, Another pool I converted was 12NTU's when I first saw it and that was hazy but in those days the owners knew no different.
Hope that helps.
Dennis, in our country the units are about £349, sorry I have actually misplaced my price sheet for the minute.