Everybody is RO water this, RO water that. I have used about 200l of RO water in the last 5 years, and my tank looks good, Is RO water really that important or am I just very lucky with the water I have been using ??
At the last GRC meeting many guys said they don't use RO, but why risk it? We have so many variables in our hobby that IMHO one should try and get as many of them to constants. I think thats why we use RO. Wessel you might be lucky now but 2morrow Randwater decides to do something funky with our water and then you have problems. I think this is a case of err-ing on the safe side.
Ok I asked Robin (Midasblenny - who we have no doubt knows what he is talking about x 100000000) the same question. I was under the impression that tap is going to add PO4 dunno why. Robin's answer was that by using tap water we are introducing heavy metals into our systems. Not a problem now BUT someday the build up of heavy metals are seriously going to cause havoc with your corals. Now I dunno what the time frame is on someday but it could be 5 years 11 months 30 days, 11 hours and 59 seconds.
Just to give you an example here. I was getting, what I thought, was RO water. It turned out the owner of the shop has not changed the RO membranes in over a year. Does not seem so long BUT according to Marco (the king of RO water) once the membranes you WILL get kak water. I took a TDS meter there and measured the tap water. I got a reading of 46. I went to his 'RO' water and that read 52.
Wizzard then got his own RO unit. The water had a TDS reading of 0. Once I started using that water I had a HUGE turn about in my tank. Coralline started growing quickly, algea blooms slowed, corals grew quicker and the tank looked better.
I feel I was using tap water to top up and I could see my tank getting worse. Using decent RO water and a good brand of salt is the best thing.
well put gavin , my mate has the the similar size set up as mine , similar lighting etc etc ... he wants to kno how come i have no algae probs , said ro water , kalkwasser mix on top ups ....he decides to prove me rong , buys sailfin tang , fox face , still got algae . then he decided to use ro water and its helping big time !!! by the way same guy who told he's been keeping marines for 15 yrs and the jebo is the best skimmer !!! i wanted to kick his arse for his arrogance !!!!
I am not sure distilled water will be cheaper. To get distilled water you have to boil it and collect the steam which is cooled again to make it condense. The extra energy required will be the main cost. Double Distilled water would cost even more.
I agree, i currently buy RO at 80c/L but when the big tank comes I'm putting in a RO unit. I would imagine you'd pay of the RO unit in a month if you compare it with the 300L per week for water changes and say 25L per day on evap. Ouch!!