Does it constantly discharge reject water even when your not using pure water

YES, you need to close both outputs or water will discharge from the brine. To stop it from running constantly most use an ASV (Automatic shutoff valve). You will also need a flow restrictor on the Brine, sized appropriately for the RO membrane

what is the wastewater to purified water ratio? can the flow restrictor be bypassed to flush?

The purified water to wastewater ratio is 1/2.

Why waste water line seems to be running a lot of water ?

Waste water is usually 1gallon RO/DI to 2 to 4 gallons waste. I brought my waste to 1 -2 gallaons of waste to 1 gallon Ro/DI with a booster pump. I also added and upgradeed from 100G to 200Gallon system. Just added another 100G ro/di canister. use the waste water for plants, and garden. If ypu can get waste tube to go out and into a diffrent barrel or yard, you can recycle it. booster pump helps to reduce the waste, unfortunately there is no other way to completely reduce it to zero. good luck.

Can you suggest asov for the 400g system? it has 3/8 input x 1/4 output - all of the asov on amazon are 1/4 x 1/4 or (rare) 3/8/ x 3/8

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- 100 GPD RO Membrane and 1812 Housing Kit | Reverse Osmosis Membrane with Housing, MNPT Elbow Fittings, Check Valve and Wrench for Under Sink RO Water Filter DIY, 1 Set

Product ID: 95887382

Details

External Testing Certification
ANSI NSF
Item Weight
0.9 Pounds
Material
Polyamide
Product Benefits
Reduces TDS
Product Dimensions
2"D x 2"W x

💧100 GPD high flow rate

🔧Complete DIY installation kit

🛡️97% contaminant rejection

13006 kr

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Description

💧 Upgrade your hydration game with pro-grade RO filtration!

EFFORTLESS DIY UPGRADE - Includes membrane housing, wrench, quick-connect fittings, and check valve—install like a pro without a plumber.
SMART WATER EFFICIENCY - Optimized for urban tap water conditions, ensuring consistent output even with fluctuating temperature and pressure.
CERTIFIED QUALITY ASSURANCE - ANSI and NSF certified with rigorous lab testing to guarantee peak performance and durability.
NEXT LEVEL FILTRATION PRECISION - Removes 97% of dissolved solids, including heavy metals and harmful minerals, for water you can trust.
PURE HYDRATION FAST RELIABLE - Delivers up to 100 gallons of crystal-clear water daily—quench your thirst without waiting.

The Membrane Solutions 100 GPD RO Membrane kit offers a high-capacity reverse osmosis filtration system designed for under-sink home use. It delivers up to 100 gallons of purified water daily, removing up to 97% of total dissolved solids including heavy metals. The package includes a membrane housing, wrench, quick-connect fittings, and check valve for easy DIY installation. Certified by ANSI and NSF, this polyamide thin-film composite membrane ensures reliable, high-quality water filtration with tested performance under standard urban water conditions.

Specifications

ASIN	B07H2Z5ZJH
Best Sellers Rank	#237,358 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,620 in Replacement Under-Sink Water Filters
Brand Name	Membrane Solutions
Customer Reviews	4.4 4.4 out of 5 stars (566)
External Testing Certification	ANSI, NSF
Global Trade Identification Number	00850071881936
Item Dimensions D x W x H	2"D x 2"W x 12"H
Item Weight	0.9 Pounds
Manufacturer	Membrane Solutions
Manufacturer Part Number	ROSL1812-100G
Manufacturer Warranty Description	We provide worry-free service and water purification solutions, welcome to disturb us!
Material Type	Polyamide Thin-Film Composite
Model Number	ROSL1812-100G
Number of Items	1
Product Benefits	Reduces TDS
Set Name	100 GPD RO Membrane Set
UPC	850071881936
Unit Count	1.0 Count

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13006 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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