General FAQ

• Shipping, Returns, and Warranty Information

  We want you to feel confident about your purchase. Here is everything you need to know about shipping, returns, and warranty coverage. Shipping Free standard shipping on most orders within the continental United States. Orders typically ship within 1–3 business days. Delivery times vary by loca...

• Understanding TDS: What Your Water Quality Numbers Mean

  If you have a TDS meter or are thinking about getting one, here is a plain-English guide to what the numbers mean and how to use them with your RKIN water filter. What Is TDS? TDS stands for Total Dissolved Solids. It measures the combined amount of minerals, salts, metals, and other dissolved s...

• What Does Reverse Osmosis Actually Remove From Water?

  Reverse osmosis (RO) is one of the most effective water purification methods available for home use. It works by pushing water through a very fine membrane that blocks the vast majority of dissolved and suspended contaminants. What RO Removes (Up to 99%) Dissolved solids — Lead, arsenic, fluori...

• Which RKIN Water Filter System Is Right for Me?

  Choosing the right water filter depends on what you need: drinking water purification, whole-house protection, or both. Here is a quick guide to help you pick the best option. I Want Pure Drinking Water ZIP (Zero Installation Purifier) — Best if you rent or do not want to modify your plumbing. ...