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Thread: Reverse osmosis, what is it
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05-02-2018, 03:45 AM #1
Reverse osmosis, what is it
Hi ., Iv never heard of it except for producing small amounts for marine tanks ( not that Iv got one ) what benefit is there and how do you soften the water my pond is 40000 ltrs and water supply is from my own wells ph is 7.6 /8.0 but very hard ,
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05-02-2018, 09:45 PM #2
All RO is is a very very fine filter- so fine that it takes any impurities and minerals out of the water leaving something that's very close to pure water. They then produce waste that contains all the bits that have been filtered out in a greater concentration. In theory you could use the waste to water the garden since the plants won't mind.
If you're using your own well then you would need a booster pump to pump your water through one or more RO membranes.
Most people buy a RO unit at least partially assembled, but you can make it up from the bits yourself if you want. I am running a large 4040 membrane on my top up. The housing is around 1m long in stainless steel. You can connect the booster pump to this using hosepipe and jubilee clips, or special RO tubing that comes with various connectors and in 2 sizes- 1/4" or 3/8".
You need to have a valve to create adjustable back pressure on the waste outlet, and most people end up fitting a solenoid valve so they can set it to open and flush the membrane periodically throughout the day on a timer.
In the UK a lot of window cleaners are now using a pole fed system with RO water as it doesn't streak the glass. It's very easy to get hold of the RO bits from suppliers of this kit to the window cleaner businesses. No idea how easy to come by this stuff would be where you are. The membrane itself will wear out over a period of time and need replacing. Membranes do not come cheap.2016 new 6000 gallon pond
https://www.koiforum.uk/pond-construc...ghlight=feline
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dbs Thanked / Liked this Post
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05-02-2018, 11:36 PM #3
Thank you that’s very clear to understand ,the ro unit is it just one , it sounds similar to water purifiers for houses but they come with 3 pods and a uv . Is it ? Cos there are many here cos tap water is not drinkable regards john
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06-02-2018, 12:18 AM #4
No, not the same as a 3 pod system. The cannister that houses the RO membrane has 3 connections- an input and at the other end an output for pure water and an output for waste.
If you're feeding chlorinated tap water into your RO setup then you need to use a purifier first. Using well water I would fit a 5 micron sediment filter infront of your RO membrane incase of larger particles blocking the membrane up.2016 new 6000 gallon pond
https://www.koiforum.uk/pond-construc...ghlight=feline
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06-02-2018, 01:18 AM #5
Could you send me a photo
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07-02-2018, 03:12 AM #6
This site is full of photos of RO systems https://www.vyair.com/reverse-osmosis/ro-systems.html
I have the 4040 Eco membrane in SS housing.
You don't need a DI resin stage for after the membrane when used on a pond.2016 new 6000 gallon pond
https://www.koiforum.uk/pond-construc...ghlight=feline
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Bonsaijohn Thanked / Liked this Post
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07-02-2018, 10:34 AM #7
I,ll have a look around they do have a lot of shops selling this sort of stuff here it’s just difficult having a technical conversation in Thai lol my everyday Thai is pretty good but when it gets technical I fall down do they use much electric btw is the name of unit 4040 specific to that company , is there a generic name for these units
Last edited by Bonsaijohn; 07-02-2018 at 10:38 AM.
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07-02-2018, 11:24 AM #8
I do travel a lot can you leave these units for a month or two unattended or do they need to be switched off
Best plants to remove Nitrate
pug has a very impressive veg filter on his pond, have a look at some of his his youtube videos....