General > Beating a dead horse
Filtration in hot tubs
shabba34:
--- Quote ---50 sq ft or 35 sq ft. Both are available. They now come from the factory with 35 sq. ft.
--- End quote ---
My question is how can the spa filter 160 gpm when there is only 70 sq ft of filtration without a bypassing??
drewstar:
--- Quote ---My question is how can the spa filter 160 gpm when there is only 70 sq ft of filtration without a bypassing??
--- End quote ---
Just a guess:
The 70 sq ft of filter is the surface area of the filter cartridge. So how much water would need to pass through a square foot of filter membrabne to achieve 160 gpm?
2.3 gallons per minute. Is that not possible? Or did I miss something?
shabba34:
--- Quote ---
Just a guess:
The 70 sq ft of filter is the surface area of the filter cartridge. So how much water would need to pass through a square foot of filter membrabne to achieve 160 gpm?
2.3 gallons per minute. Is that not possible? Or did I miss something?
--- End quote ---
Yes, that is true, but not without minimizing the micron capabilities of the filter and starving the jet pump for water. Water is moving through too fast causing a lot of back pressure. This causes deminished jet pressure and lack of filtration capabilities. Rule of thumb is 1gpm per 1sq ft of filtration. Remember also, that dirty filters further hinder the situation. I realize that the claims of the no bypass during filtering are true, just not at the gpm's that were stated. Commercial or residential pools will allow for up to 3gpm to 1 sq ft of filtraton, however not recommended due to reasons stated above. Most contractors will equally match the filter sq footage to the size of the pump. ;)
MarKee:
When you pull from 360 degrees around the filter instead of one direction (the direction of the wier gate), it's amazing what you can accomplish!
East_TX_Spa:
What I've never understood (and maybe someone can explain it to me) is why all of these companies that "filter 100% of the water" put by-pass valves in their spas. Don't by-pass valves do exactly that....by-pass the filters?
I'm anxious to hear the answers.
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