how many gallons of water is wasted to make 1 gallon of filtered water?

Dear valued customerThank you for your interest in express water product, base of the incoming water pressure of 60-65 psiThis system will discharge 3-4 gallon of water to make 1 gallon of purified waterLower water pressure will increase the discharge ratePlease note:Below are the 3 factors that change the discharge rate1- Incoming water pressure2- Quality of the incoming water3- Temperature of the incoming waterBest Regards

Is there an indicator that tells you when the filters need replacing, or do you guess ~6 months for uv light and the ph cartridge & 12 for membrane?

Our recommended change is as follows: Every 6 Months: Alkaline Filter Sediment Filter GAC Filter Carbon CTO Filter Every 12 Months: Post Carbon Inline Every 12-24 Months: RO Membrane Filters may need to be changed sooner all depending on the quality of water and usage.

What is the difference between this system and the roalkuv10dcg system sold at home depot? also, how much more for the pentair membrane?

Dear Richard, Thank you for the opportunity to assist you! Please Note, all of our Express Water under sink RO Systems will include a 4-Gallon Volume Tank, RO Faucet, easy to follow instructions and all the connections required for installation. The only additional items you will need is a Tube Cutter or Razor and a Power Drill. These RO Systems are available in different packages and will incur additional fees according to the upgrades included. RO = Reverse Osmosis 5-filter standard ALK = Alkaline Filter upgrade included UV = UV Light Filter upgrade included #10 in model # = 100 GPD (rated at 100 gallons per day) "D" = Deluxe Chrome Faucet "M" = Modern Chrome Faucet "C" = Clear/Transparent 3- Bottom Housing upgrade "G" = Pressure Gauge upgrade included "BN" = Brushed Nickel finish upgrade on Faucet included in either Modern or Deluxe style. For your reference, please click the link below for the Deluxe and Modern Faucets in Brushed Nickel finish: https://www.amazon.com/stores/page/090D561A-16F2-4671-B94F-EB04766C560C?ingress=2&visitId=b83d0f8f-4451-40f6-a8bc-1362a841f40a&ref_=ast_bln Therefore, the differences between this ROALKUV10M and ROALKUV10DCG, is that the ROALKUV10DCG will include an upgraded 3-Bottom Clear Filter Housing + Deluxe CHROME Faucet and a Pressure Gauge. Please note, these RO Systems listed here on Amazon are pre-packaged deals. To better assist you with custom additions such as a Pentair Filter, please do not hesitate to contact us directly Monday- thru Friday, 8am-5pm (PST. We are here to help! Thank you and have a lovely day! Best Regards, Express Water Team Toll Free: (800)992-8876 Mon-Fri: 8am-5pm (PST)

Purification Method	Reverse Osmosis, Ultraviolet
Additional Features	NSF certified, Chlorine Reduction
Container Type	Bottle
Capacity	4 Gallons
Item Weight	31 Pounds
Item Dimensions L x W x H	15"L x 5"W x 17"H
Material Type	Modern Chrome Faucet

EXPRESS WATER UV Reverse Osmosis Water Filtration System – 11 Stage UV Water Filter with Faucet and Tank – Under Sink Water Filter with Alkaline Filter for added Essential Minerals 100 GDP

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