The Plus Upgrade kits transform your "base" model RO/DI to the more feature rich Plus series. Follow along today as we install them! The Plus Upgrade kits come with a TDS meter, pressure gauge and flush kit. The TDS meter will measure the total dissolved solids, which is a relative measure of water purity coming out of your RO system as well as your DI resin which is ultimately the water you are using. The pressure gauge measures water pressure entering the RO membrane which should ideally be around 50 PSI. The flush kit is basically a bypass for your flow restrictor on your membrane. This will drastically increase the flow over the surface of the membrane and flush deposits off which can hurt longevity, water quality, and water production from the membrane. Installation is pretty simple, to begin we'd recommend laying down a towel to catch any potential spills. The Flush kit installation is as easy as pushing in the push-connect collets on the flow restrictor and removing it and then replacing it with the new flush kit. It does matter which direction you install it so make absolutely sure the flow arrow is pointed away from the membrane. To install the pressure gauge, locate the feed line on your RO membrane which is the side which is the on the cap side of the housing which only has a single line entering it. If this is a BRS system it will likely be red. Just clip this line and push both ends into the tee on your pressure gauge. The TDS meter installation can appear pretty daunting, but in reality is actually pretty simple. The first step is mounting the monitor. Use the included Velcro stickers to mount it somewhere easy to see and insert the probes into the push connect tees. One probe is labeled in and the other out. On the back of your system locate the line feeding the “in” of your DI canister, clip that line and insert each end into the tee labeled “in”. Now locate the line coming out of your DI, clip it and insert each end into the tee labeled “out”. Once that is done bundle up the excess wire and secure it. Once everything is installed check for leaks and you are done! Have questions? Let us know in the comments below! Be sure to hit subscribe so you don't miss our new video coming out next Friday. Connect with us on Facebook: Check out our pics on Instagram: *Legal Stuff* The purpose and content of this video is to provide general information regarding the products and their applications as presented in the video. Aquatic sales solutions, inc. And its officers, directors, employees and agents disclaim all express or implied warranties, in any way, related to the products and their application as presented in this video, make no representation or warranty regarding the products and the application as presented in this video and shall not be liable for any direct or indirect losses or damages of any type, including but not limited to punitive damages, or from personal injury or death resulting from or in any manner related to the video, and the products in and contents of the video. The viewer expressly agrees that aquatic sales solutions, inc. and its officers, directors, employees and agents shall not be liable for any damages or losses related to the products in and content of the video and hereby agrees to hold the foregoing harmless from any such losses or damages.