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Pet Forum / Aquaria / General / October 2004water filters
Hi, I've got a problem............... my water is HIGH in phosphates, very high.. I want to put a filter on my tap water to facilitate water changes without putting all that phosphate in....I'm fed up putting in the phosphate removers to my filter - I want to remove at source (OK rant over) Any suggestions on a good filter/RO unit to go for? I have a 1500 litre tank and want to do 15% changes every 2 weeks. tia, Sky. > Hi, > [quoted text clipped - 12 lines] > > Sky. I think I remember reading that particular plants were especially good at removing phosphates. Might be something there worth researching?  Signaturewww.NetMax.tk | Hi, | | Any suggestions on a good filter/RO unit to go for? I have a 1500 litre tank | and want to do 15% changes every 2 weeks. | | tia, http://www.melevsreef.com/ro_di.html I bought one of these and have been quite happy with it. Hmmmmmm. First, do you know how the phosphate got in there? If it's from fish food, yet your tap water is low phosphate you need not filter the tap water! What are you keeping in the tank? Let's suppose the issue is the tap water (and by now you'll have guessed that you should really test the tap water!). The economic choice is between buying RO at your local shop, transporting it home and changing water. Or buying a RO filter and putting it on you domestic water supply. You are changing around 50 gallons every two weeks - at my local shop that would cost £25 and weigh (literally) a quarter of a ton so your water change would require almost military planning (but at least the water comes pre heated where I buy it). If you buy a RO you've got a whole host of other problems not least storing 50 gallons and what to do with the 200 gallons or so of waste water that you'll have to lose. Even so it should be a lot cheaper. However, I think you should first work out a strategy for minimising the phosphate input before dashing down to the shop to buy the RO unit. It's just I'm having difficulty with the idea that the phosphate in your tap water is so high as to cause a problem that Rowaphos can't fix without there being a pretty serious problem as regards the Drinking Water Regulations. The only other thought I have is that less frequent BIG water changes are more effective at changing water chemistry that multiple small ones, so provided your tank can take the strain you might be best advised to do three or four 30% changes at weekly intervals to sort out the current problem and then revert back to your usual pattern. Mark > Hi, > [quoted text clipped - 13 lines] > > Sky. Mark, Thanks for the reply. The proble is with the water supply. I have rowaphos/tcm phosphate removers and this takes the tap from > 5ppm to less than 0.5 in the tank. What I want to do is stop that level of phosphate getting into the tank - I'd rather remove it at source! The last big water change I did caused an algae bloom which took a while to clear (& led to my investigation of the tap supply). What do you think? Should I get RO or led the resins take it out in the tank filter - I'd prefer the former but I agree about the logistics of producing (wasting) and store the suffient volumes. Any thoughts on how best to organise this? Cheers, Sky > Hmmmmmm. > [quoted text clipped - 47 lines] > > > > Sky. > What do you think? Should I get RO or led the resins take it out in the > tank > filter - I'd prefer the former but I agree about the logistics of > producing > (wasting) and store the suffient volumes. Any thoughts on how best to > organise this? In view of the recent weather I'm sure I don't need to mention how much rain the average house gets :-) Certainly enough for your needs, and it contains far fewer chemicals than tap water. Can you collect and store the water from your guttering ?? SignatureEdward Cowling - London - UK Edward, I've heard story about leeching from roof materials & so have been put off using rainwater - stuff yopu can't easily test for .... Sky. > > What do you think? Should I get RO or led the resins take it out in the > > tank [quoted text clipped - 14 lines] > > Edward Cowling - London - UK Well, the first thing I'd do is recheck the tap water. Here's a link to the Drinking Water Inspectorate website http://www.dwi.gov.uk/pubs/tap/ The maximum level of phosphate appears to be 2,200 micrograms per litre which I think is 2 ppm. That said. if you are doing 50 gallon changes you would be much better off with a RO unit. Some people plumb them in so the waste water goes into the cold tank - that way it's mainly used for flushing the loo or washing. You'll need an "intermittent kit" because even the slowest unit wiill make more water than you will use (7 gpd = 98 gallons a fortnight). The units are more efficient at some temperatures than others. Even so 200 gallons of tap water costs about £1 so you'll be quids in with a RO unit. Mark > Mark, > [quoted text clipped - 83 lines] >> > >> > Sky. Mark, Thanks - what is an intermittent kit & who does them? Cheers, Sky. > Well, the first thing I'd do is recheck the tap water. > [quoted text clipped - 99 lines] > >> > > >> > Sky. They come with the RO (usually for a few pounds more). Essentially it's a tap that turns off the water flow and keeps the RO membrane wet (if the membrane dries out the filter fails to work). The kit allows you to turn the RO on and off rather than wasting the RO water once your container is full. > Mark, > [quoted text clipped - 126 lines] >> >> > >> >> > Sky. |
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