Just to make sure that the terminology is understood, you want RO/DI water, not just RO (which is widely available.) The De-ionizing filter is the final stage of filtration after reverse osmosis and what you want to be using.
A very useful tool to have is a TDS meter. I have the fifty dollar one, but the twenty dollar one should suit your needs. This tool measures the amount of dissolved solids in the water and allows you to determine the status of your RO filter and DI cartridge.
It sounds like I am trying to sell you on a bunch of equipment that is unnecessary, but I'm not. There is nothing wrong with reefing on a budget. Just keep in mind that this budget has to involve some sort of commitment to the basics. This is not a cheap hobby; you need to have a deep understanding of this.
Kind of like buying a dog; a person goes out and gets a dog, a water bowl, food bowl, and a leash. Later on, the owner finds out that dogs need to be vaccinated, licensed, fed, trained, groomed, exercised, etc... AND, they live for many years!!
We are just trying to give you a much better understanding of the proper equipment needed which can increase your chances of success by leaps and bounds.
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If you really want to save the planet, then go somewhere else!!
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