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Home      Reply		Viewed: 364 -- Replies: 36
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Posted	reverse osmosis units.
27-07-2006 18:35 by tony mcculloch	just bought a complete marine aquarium which came with an RO unit, everything is in good condition and up and running but is there a way that you can tell if the RO filters need changing? I believe the filters are almost 12 months old, plus Is RO water safe to drink? cheers.
27-07-2006 18:58 by trik	yes tony ro water is fine to drink, also a tds meter will tell you the values of the water after the ro unit , if high readings then they may well need replacing. An easy test is to test for nitrates and phosphates straight from ro unit. hth.
27-07-2006 18:59 by kevin george	change the filters and ro water is safe to drink
27-07-2006 19:20 by trik	the waste water from a ro unit is better to drink than tap water, i use the waste to top up my pond.
27-07-2006 19:46 by tony mcculloch	thanks guys, I dont have a tds meter so I will have the water tested for nitrates and phosphates. I know that the nitrates normaly comes out of my tap at 25. I hate drinking tap water but will give it a shot. thanks again.
28-07-2006 00:44 by Ray	Hello Tony,if your ro has a di do not drink the water,as for the waste how can it be better then tap water ? it will have a higher concentrate of impurities in it,you can get a tds meter for £17.00 from osmotics.co.uk,ray.
28-07-2006 11:41 by telboy	why would anybody wanna drink fish poo + pee? mmmmmm strange
28-07-2006 14:28 by tony mcculloch	cheers ray, will take a look at that. telboy, the RO unit is attached to the tap and not the tank, dont know where fish poo + pee comes into it? I know you cant drink the waiste water and I will be using this to do the water changes on my malawi tanks, just wanted to know if the good RO water is safe to drink?
28-07-2006 14:32 by tony mcculloch	PS, RAY, what is a di? and did you manage to pick up an RO unit as you mentioned a little time ago?
28-07-2006 15:32 by telboy	i stand corrected,was only a joke tony i know nowt bout ro's can you use the waste water for malawis + other fish ?if so sounds like a good option for all this water loss eh?
28-07-2006 15:39 by keith t	RO filters filter water from tap for every one part of filtered water collected you waste 3. I would not recomend to anyone about drinking the waste as this contains all the yuck. The only thing u can use the waste water for is watering your garden. It is recommended to use a DI (dionised water ) filter as these are good at removing phosphates in your tap water. Been using one for some time cant recomend it enough. They can be slow unless u have a pump which i dont. It takes me about 4 hours to fill a 25 litre container.
28-07-2006 15:49 by keith t	I use a 3 stage + di filter which i bought of ebay from mws (moseswatersystems) I found these to be one of the cheapest and best value but there are better and alot dearer one around but u can get just the 3 stage for £30 and add ons ie di is £15. Another thing is that u will save on dechlorinator as u no longer need it and my ph on tap water is about 8.2, after its been filtered its at 7.0
28-07-2006 17:32 by Ray	Hello Tony,I bought an ro from osmotics,4 stage £57.00,a good deal I think as it also has fittings to allow flushing the membrane,a DI is a mixed resin bed that goes after the ro membrane,giving me a tds reading of zero.I disconect the DI to drink the water.
28-07-2006 18:19 by trik	the waste water is safe for our use . test it. the filters take out the gunk thats why you have them , the waste is no good for marine setups. this is the mechanics of how a ro unit works. osmosis is the natural process by which selective molecules in a aqueous solution can pass through a semi permeable membrane, while the movement of other molecules due to size, shape or other reasons is ristricted. in order to preserve a balance, nature deems that water molecules will pass from a less dense solution into a denser solutionin order to dilute it and create an equilibrium; for our purpose this is not what we want. Therefore, mains water pressure is used to force water molecules the "wrong way" through the membrane, leaving the unwanted pollutants behind and flushed to waste. in our case of ro water you have a minimum of 2 filters before the membrain that take out particals, including nirates , phosphates , pestercides, heavy metals, and a whole host of other substances, so your waste water is better than tap water.because these toxins have already been removed by your filters on your unit.
28-07-2006 18:21 by trik	o and kevin how do you think a 2 stage fillter system works under your kitchen sink. same as.
28-07-2006 18:46 by kevin george	explain
28-07-2006 18:49 by kevin george	trik what r u on about i have an ro unit and used it on my marines and why r u getting on my case.
28-07-2006 18:52 by kevin george	if u have an ro unit that as been used for 12mnths isnt it best to change the filters and membrance incase it is expired.
29-07-2006 01:28 by tony mcculloch	not sure what my RO unit is, it has a white tube across the top, 2 canisters underneith,one contains a wool on a spule type filter and the other filter is like a honey combe.
29-07-2006 09:31 by paul stevens	Yeah trik why you getting on kevin's case ????
29-07-2006 09:39 by kevin george	oh look its not a fish forum but a circus.
29-07-2006 09:41 by kevin george	the honeycombe thing is the membrane and normally needs changing once every 6 months but that is just a estimate
29-07-2006 09:56 by Ray	Tony it sounds like a three stage unit,the tube at the top is prob the membrane housing,the other two are pre filters,ideally you should have a carbon filter before the membrane,and a DI after to give pure water as I am guessing you want the water for marines,a tds meter is a cheap way of testing the product,but run the unit for an hour or so then test the product with a hardness test kit it will let you know if the ro unit is working,post a pic then we can see the unit,ray
29-07-2006 12:29 by tony mcculloch	Here is a photo of the RO unit and, also some of the tank and equipment.
29-07-2006 12:30 by tony mcculloch	The sump.
29-07-2006 12:31 by tony mcculloch	for nitrates or whatever???
29-07-2006 12:32 by tony mcculloch	the lights.
29-07-2006 12:35 by tony mcculloch	the tank.
29-07-2006 12:37 by tony mcculloch	a few of the occupants.
29-07-2006 12:37 by tony mcculloch	mushrooms.
29-07-2006 16:36 by trik	looking good tony.my only concern would be that stick thing 3rd pic down, im not sure but if a nitrate remover it may be for fresh water and salt water recharges it , i could be wrong though.
29-07-2006 18:36 by tony mcculloch	well I managed to pick up a tester for the RO water and I'm pleased to say it tested good, so well chuffed there. Trik, that stick is called an ECO AQUALIZER, not sure about fresh water, but it is deffiniatly for marines, I saw the same one today for £99
29-07-2006 20:05 by trik	nice one . iv never seen one for marine , does it work tony?
29-07-2006 20:35 by nige	they suposedly ionise things in the water making them stick to something e.g. fiter media
29-07-2006 20:54 by tony mcculloch	I would imagine that they work as they have a good read up on them, I personaly wouldn't spend so much on one but as I got one with the set up, theres nothing lost.
30-07-2006 16:00 by trik	Tony here is a link to a marine sight i use and a thread about your eco stick , hope this helps , these guys on here are good. http://www.ultimatereef.net/forums/showthread.php?t=186260&highlight=Aqualizer
30-07-2006 18:05 by tony mcculloch	Thanks trik, will check that link out now.

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