General > Beating a dead horse
By-pass Filtration
Chas:
There are many spa makers out there who plumb in a spring check valve which closes when the small circ pump is the only thing running. The valve will do the same when the big pump in on low speed, if there is no small circ pump. It will then kick open and allow bypass when the pumps are on high speed.
This is still bypass filtration - but I have seen the reps from these factories look me in the eye and tell me that their spa has "no bypass filtration."
Also, there are a few makers who plumb the bottom suction fittings into the pump and run a pressure-side filter. BUT these folks usually equip that filter with a pressure-relief valve which is in fact a bypass system. The bypass usually opens when the jets are on high - or when the filter starts to get loaded up with gunk.
hymbaw:
If you look around the sides of the footwell and see intakes.........the spa bypasses the filter at some point. Hot Spring is the only spa that I've seen without 'em.
Another way to tell that a Hot Spring doesn't bypass the filters is the poor jet pressure ;D Right, Term!
SerjicalStrike:
Sundance does not bypass the filtration system on the 880 series. Filtration pump is totally separate from the jets system and there are no bypass valves.
Chas:
But that's the whole point. It's fine to have no bypass on the small circ pump - works great. But you need massive filtration from time to time, and HS does this by very simply pulling ALL of the water that the pumps move through a filter.
A no-bypass system on a set of good-sized pumps can do in ten minutes what a tytpical system needs a couple of hours to do.
SerjicalStrike:
I would think turning the spa water over around 100 times per day without the main pumps running would be considered massive filtration. You only need to turn the jets on when you want to use them and they are not affected by how dirty the filter gets because they do not pull through the filter.
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