Originally Posted by BambooBen
So is there a filter that would be a better option than a ro
Lowes home improvement for instance has about 10 different inline filters for sale.
The ones I have seen at Lowes are typically just carbon filters which pretty much just remove chlorine, some organics, and some heavy metals. They do carry RO
(reverse osmosis) units, but their prices are higher than what you can find online IME. I know there are several folks who have bought units from Pure Water Club through Ebay (myself included). I will say I think I would have gotten a better product (and got EVERYTHING I needed to hook up the unit) from Bulk Reef Supply for not that much more.
You really want an RO
with a DI
(deionization) stage (RODI
for short). The typical staging is:
sediment filter>carbon block>RO
That is a 4 stage system. Some systems use multiple carbon blocks of different microns or multiple deionization stages. you have to read the fine print on systems with more stage to figure out exactly what you're getting. more stages are generally necessary only if your source water has a lot of contaminants and more stages generally means that each stage (filter) will last a little longer.
I recommend you check out the videos at least on Bulk Reef Supply's website as they do an excellent job of explaining how the systems work and all the accessories you can get to make the RODI
more functional. Their customer service is also very good.
There are portable units that you can easily attach to a sink as needed, however you can get some valves to "permanently" plumb in an RODI
unit under a sink so you can still use the sink faucet whenever you need to. If you are fortunate enough to have a water source close to where your tank is (or you know how to snake the line through the wall), you can run a line from the RODI
to a valve in a sump or tank for an auto topoff.
The main reason we use RODI
water is to limit nutrients for nuisance algae and to control exactly what we are putting back into the tanks for the corals. I can't really explain exactly why algae can get out of control so fast with tapwater used in a saltwater tank compared to a freshwater tank, but trust me, it can go haywire quick! Cyanobacteria (sometimes called red slime algae or blue green algae) is the worst with hair algae being a close second.