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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Membrane Solutions 100 GPD RO Membrane and 1812 Housing Kit

Product ID: 95887382

Details

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

💧100 GPD purified water output

🧪97% contaminant rejection rate

🛠️Complete DIY kit with wrench & fittings

R$822

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Description

💧 Elevate your water game—DIY purity, pro performance!

ADVANCED FILTRATION TECH - Removes 97% of dissolved solids and heavy metals with ultra-fine 0.1nm membrane—drink with absolute confidence.
PURE HYDRATION POWERHOUSE - Delivers up to 100 gallons of crystal-clear water daily—hydrate smarter, not harder.
LAB TESTED QUALITY ASSURANCE - Crafted from premium Polyamide Thin-Film Composite and independently verified for peak performance.
DIY INSTALLATION MADE EFFORTLESS - Includes membrane, 1812 housing, wrench, and quick-connect fittings—build your own RO system with zero hassle.
OPTIMIZED FOR REAL WORLD CONDITIONS - Rated at 100 GPD under ideal conditions, with clear guidance on performance adjustments for temperature and pressure.

The Membrane Solutions 100 GPD RO Membrane and 1812 Housing Kit is a premium DIY reverse osmosis filtration set designed for under-sink installation. It delivers up to 100 gallons of purified water per day by removing up to 97% of total dissolved solids, including heavy metals, using a high-quality Polyamide Thin-Film Composite membrane. The kit includes all necessary components—membrane, housing, wrench, and fittings—enabling easy assembly and reliable performance verified by independent lab testing. Ideal for professionals seeking cost-effective, high-performance water purification with clear operational guidelines.

Specifications

ASIN	B07H2Z5ZJH
Best Sellers Rank	#281,992 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,846 in Replacement Under-Sink Water Filters
Brand	Membrane Solutions
Brand Name	Membrane Solutions
Customer Reviews	4.4 out of 5 stars 242 Reviews
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 Highlight	Reverse Osmosis Membrane with Housing, MNPT Elbow Fittings, Check Valve and Wrench for Under Sink RO Water Filter DIY, 1 Set
Item Weight	14.4 ounces
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	Polyamide Thin-Film Composite
Material Type	Polyamide Thin-Film Composite
Model Number	ROSL1812-100G
Number of Items	1
Product Benefits	Reduces TDS
Product Dimensions	2"D x 2"W x 12"H
Set Name	100 GPD RO Membrane Set
UPC	850071881936
Unit Count	1 Count

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R$822

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered 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 Brazil.

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TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

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