Twin Intex SWG installation IN-ground pool, Modded to run 24hrs - Pics and video link coming soon!
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Iv'e been wanting to do this for awhile and coming back from vacation to a leaking DE filter (luckly my good neigbor caught it at turned my breakers off) and a nice green pool was enoght to kick this project upto top priority.

I just installed the 2nd unit July 14th, I modded both the units soo they can run manualy and 24hrs/day if i need it. This should yeild up to 1,200 grams (42.3 oz. or 2.64 lbs.) of chlorine per 24/hrs. by a calculation from another thread (thanks jason )

EDIT 7-17-11: The 1st cell was calcifyedduring the first test, with both cleaned and installed Im getting a 8ppm FC rise via each pass thru the system at 3000gal/hr. so by that calculation the pair are producing 4.8lbs/24hrs See my calculation thread here: calculating-swg-output-using-the-pool-calculator-t36211.html

I shot a video for each mod, the first is 38 mins, 2.5gigs the second is 24mins.
I ment these for Utube but they limit vids to 10mins and my software for my 2011 Panasonic camcorder won't cut videos up that i can figure.
Mod 1: reversable to stock, simple wiring overide, whenever the flow switch is on, the unit turns on the blue Chlor LED and makes chlorine, a green power LED replaces the sleep light. the logic board functions are not used (no salt level checking)

Mod 2: I wanted the unit to operate stock and have a option to manually overide for more chlorine. Unit works stock, added green and red LEDs to indicated cell polarity(curious how often it does this for cleaning) Added a set of realys ans fan overide triggered by a external AC adapter, when the unit is sleeping i can have a timer switch the powerpack on activating the Chlor cell and get another 12hrs if i need it

I'm going to upload the howto vids and provide links here, prob use google docs.

So I'm still superchlorinating with liquid chlor (2gal. 10% for 4.99 on sale @ NPS )
but i need to help maintain that high level without dropping $20 of liquid into the pool a night.
SO here are the test results for the twin system

Tested at filter purge BEFORE generators
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FC: 27
CC: <.5
PH: 7.1 (dropped some pool acid in lastnight to lower TA
TA: ? got strange colors prob due to high Chlor. but was 80
CH: 300
CYA: 45 and on the rise, was 35, added 4 lbs CYA yesterday, needs to fully disolve in filter.
SALT: 4000ppm
Temp: 87degF

Tested at pool return (using a hose adapter to fill water bottle thru a 4 ft. hose)
cells are calcifyed at this point, intex #2 is throwing a low salt error, this has always ment a clogged cell when I know my salt level is correct
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FC:32.5
CC: --
PH: --
TA: --
CH: --
-- = not tested

Tested at pool return (using a hose adapter to fill water bottle thru a 4 ft. hose)
Cells freshly cleaned and reinstalled
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FC: 35
CC: --
PH: --
TA: --
CH: --
-- = not tested

So it looks like on clogged up cells I still get a gain of 5.5ppm @ 3000gal/hr on a freshly clean DE filter backpressure is approx 6psi right now.

On the pair of freshly cleaned cells i get a gain of 8ppm @ 3000gal/hr on a freshly clean DE filter backpressure is approx 6psi right now.

more pics

more pics

This is Intex 2, modded to have a manual overide but retains full OEM functionality
That green LED hovers just above the digital display and indicates foward polarity to the cell, if it goes to rev. then the grn goes out and a red LED lights

shot of the whole slab (mess)

I should note before I get blasted in this thread, I had a little leak at the fernco rubber pipe couplers, the wiring is temp so its just plug and play, the hole in the ground will get filled back in when i have the money to replace the Jandy valves and replumb the pumps inlet for better flow, and yes thats a intex 1000gph cheap pump temporarly installed in place of my Pentair whisper flow pump that decided to have a HOT chassis! If the system is fully primed with the main 1HP pump I can actually switch over to the Intex pump and it will lift the water 5ft and push thru the filter, its the gravity pulling the water down hill to the return that makes this possible, that little pump probaly has no real lift HAHA

Pool looking better and better, FC held at 27ppm since yesterday, temp is 104 today, water 87
pump and generators running 24hrs/day to clean her up.

After using this setup for awhile I've found that even with a good CSI I still get plate calcification like crazy after just a few days. After 5-6 their totally gummed up with white good and I have to clean them. This is getting to be alot of maintainance. Before the mod I ran the single unit for months starting in the winter and never neeeded to clean it. I suspect that the polarity reversing is Very important to self clean and my mod has undone this. I will look into building a small circuit based on a 555 timer IC to swittch the polarity every so often. My second unit that is suposed to work with the overide off just keeps giving me a low salt error. Ive tested and its high If anything and it dose this on a freshly cleaned cell.
My question for the group is dose anyone know the switching interval of ant of the systems out there? I can set the timer circuit I build for any time, 5 mins, once an hour, once every 2...I definalty think at least a few times a day would be good.

I am assuming you are referring to the polarity switching:

I have this chlorinator http://www.canadiantire.ca/AST/browse/2/OutdoorLiving/PoolsAccessories/PoolChemicalslAccessories/PRD~0813777P/Krystal+Clean%26%23153+Salt+Water+Chlorinator.jsp?locale=en and the manual says that this system reverses polarity every 24 hours.

Switching polarity every four hours of active time is fairly common. AutoPilot units are programable for 2, 4, 8, or 16 hour reversing times.

Nice modification. I wish I had the skills to do it. My brother wants a SWCG for his inground but dosent have the $$$$. I have 6 unopened intex SWCG in my garage I got at walmart for $50 each. Keep us informed how the mod works out.

Glad it's working for you! Is the one with the black hoses leaking?

Thanks guys! thats just the i feedback I needed!

It was the one closer to me in the pic, I wrapped the threads w/ teflon tape to try it and it fixed the leak the other coupler with the metal sleeve is now degrading and my hand gets black when i toch the inside.