https://store.afwfilters.com/portable-ro-systems/
I have the $139 one, but it was about $20 when I bought it.
Amazon has it for $6 more but with free shipping so https://www.amazon.com/Portable-Aquarium-Filter-System-Membrane/dp/B004N7QUXW
My water is soft and neutral but nor enough for Altum angels. That company sells units of all sorts. You probably need something different than I do. My unit has Carbon, RO Membrane and De-ionizing resin modules. I should have traded the carbon for a sediment one. But its not a big deal. My well water is pretty perfect for soft water species. Namy of them spawn in it. Of course I would never consider myself as able to get Altums to spawn, not many do.
I have the $139 one, but it was about $20 when I bought it.
Amazon has it for $6 more but with free shipping so https://www.amazon.com/Portable-Aquarium-Filter-System-Membrane/dp/B004N7QUXW
My water is soft and neutral but nor enough for Altum angels. That company sells units of all sorts. You probably need something different than I do. My unit has Carbon, RO Membrane and De-ionizing resin modules. I should have traded the carbon for a sediment one. But its not a big deal. My well water is pretty perfect for soft water species. Namy of them spawn in it. Of course I would never consider myself as able to get Altums to spawn, not many do.