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Home      Reply		Viewed: 363 -- Replies: 15
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Posted	100% ro
25-10-2006 17:04 by samy	can u keep discus at 100% ro water as im going to buy some and the guy keeps them at 100% ro.
25-10-2006 17:07 by wayne	you just answered your own question thier , can you keep neons with guppie because a guy im getting them off keeps them with guppys
25-10-2006 17:09 by Ray	No,not long term,all water needs to have some minerals for fish health,also depends on the age of the fish as to the hardness levels.
25-10-2006 17:13 by Ray	I will add a bit too that,if the guy has an old RO the membrane may not be totally efficient,also does he have a DI on the unit,trouble is theres RO and RO if you get my meaning
25-10-2006 17:25 by samy	yes i understand ray! they r 5 inch and he has had them for about 10 months and always kept them in 100% ro thats what he told me. question is if i put them in 80%ro and 20% tap will they die??
25-10-2006 17:36 by Ray	no they wont die,I would ask him what the water parameters are,he must know,I would hope,then match yours to that then you can ajust to what you want,as long as changes are not extreme the fish will be fine.
25-10-2006 18:40 by keith t	u need some ro right if u want to use 100% to replace essential minerals
25-10-2006 20:15 by Phill Austen	As Ray says most RO is not devoid of dissolved solids usually has conductivity of 10-20ms unless it has a DI unit on the end.
25-10-2006 21:57 by samy	check this out guys,this ro unit including postage is 55 pounds
25-10-2006 21:58 by samy	and this one of ebay is 70 pounds
25-10-2006 21:58 by samy	can u tell the difference??
25-10-2006 22:59 by paul stevens	I can they are both difference prices... And the first pic is bigger...
26-10-2006 09:31 by Alan	Take a look at www.ro-man.co.uk they will probably have a similar unit as well although I would consider a unit like that bare bones certainly not good enough for marine. Marine you need multi stage with a DI stage after the membrane that should give you near zero TDS.
26-10-2006 09:34 by Alan	Fish kept in pure RO water would die intantly as there is no disolved oxygen in it so he cannot be using pure RO water. He could of course be using 100% airated RO water but again very bad idea as the fish will become mineral depleted and die. He could be using 100% remineralised RO water but as said above ask him what the TDS is of his tank water as well as hardness and the like and also establish ph. One real concern of 100% ro is the instability of the ph it would be up and down like a yo yo.
26-10-2006 10:36 by keith t	Alan as we are all not fish keepers but really water keepers, what do you suggest then, As my tap water has high nitrates, is very hard and obviously loads of metals, ro water which is what all my lfs use is not very good in your opinion. I use tap water for my malawi set up as my tap has a ph of 8.0 - 8.2 (i use rowaphos in the filter for this one ) and i use tap to initially fill the other tank and have always done water changes with ro+di, as this is my planted tank, never had any trouble with fish dying in either set up, only the odd new edition once in a blue moon. Always looking at suggestions and how other peeps do it. Just going to purchase a freshwater nitrate filter to add to the hose for when i fill my malawi tank. P.s never bothered testing gh or kh, just does my brain in
26-10-2006 12:07 by Alan	What is your nitrate level in your tap water it should not be above 50 ppm if it is complain as it is breaching the law. What you do is dependent on the fish you keep if discus or something like that I would recommend that you use ro water and then remineralise it and airate it before use. Incidentally I believe if you have hard water the level of metals in your water will be lower in a comparable area with soft water. gh and kh is a pain but vital when keeping any fish that strays from the norms of the average fish keeper such as discus or rift valleys in my opinion hardness is as critical as ph for some fish certainly discus and rift valleys.

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