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RO, DI, and Other Water Filters Information

To avoid headaches that can arise from using a tainted freshwater source, such as from the tap to make up saltwater solutions and replace evaporated aquarium water, learn about using a reverse osmosis (RO), a deionization (DI), a combination RO/DI unit, or other type of simple filter to purify the water before adding it to your system.
How To Make a Simple PVC Tap Water Filter
With this simple do-it-yourself PVC tap water filter designed by Don Carner, you can achieve about the same results as with a more costly commerical TWP (Tap Water Purifier) to get clean water for topping-off your aquarium or making up sea salt mixes.
Tap Water Purification Methods
From your About Guides, here are methods for how to purify tap water before using as make-up or top-off in saltwater aquariums, as well as a list of other alternative fresh water sources one can choose to use instead.
DI Filters Explained
From the FINS Reefkeepers FAQs, information about how De-ionization (DI) Filter units work and are used for water purification.
How Reverse Osmosis Sytems Work from SpectaPure
Here is product information direct from SpectaPure about how their line pressure operated RO systems work, which helps to explain the basic principle of how most reverse osmosis units function in general.
How RO/DI Systems Work from SpectaPure
Here is product information direct from SpectaPure about how their line pressure operated RO/DI systems work, which helps to explain the basic principle of how most reverse osmosis/deionization units function in general.
RO Filters Explained
Information from the FINS Reefkeepers FAQs about using Reverse Osmosis filter units for water purification.

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