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expiredRed_Liz | Staff posted Mar 25, 2026 04:15 PM
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expiredRed_Liz | Staff posted Mar 25, 2026 04:15 PM

Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System

+ Free S&H

$187

$300

37% off
Amazon
136 Comments 82,547 Views
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Update: This popular deal is still available.

WaterdropDirect via Amazon has Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System (WD-G2-W) on sale for $199 - $11.95 when you apply promo code G2WAAERM at checkout = $187.05. Shipping is free.
  • Note: You must be logged in to apply promo codes; promo codes are typically for one-time use and don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.
Thanks to staff member Red_Liz for finding this deal.

Editor's Notes

Written by qwikwit | Staff
  • This offer is $92.94 lower (33% savings) than previous Front Page deal that earned 57+ thumbs up.
  • Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
  • If you're not a student, there's also a free 1-Month Amazon Prime trial available.
  • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by Red_Liz | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This popular deal is still available.

WaterdropDirect via Amazon has Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System (WD-G2-W) on sale for $199 - $11.95 when you apply promo code G2WAAERM at checkout = $187.05. Shipping is free.
  • Note: You must be logged in to apply promo codes; promo codes are typically for one-time use and don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.
Thanks to staff member Red_Liz for finding this deal.

Editor's Notes

Written by qwikwit | Staff
  • This offer is $92.94 lower (33% savings) than previous Front Page deal that earned 57+ thumbs up.
  • Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
  • If you're not a student, there's also a free 1-Month Amazon Prime trial available.
  • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by Red_Liz | Staff

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Model: Waterdrop Reverse Osmosis Water Filtration System

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Sort: Lowest to Highest | Last Updated 4/5/2026, 11:38 PM
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Top Comments

Punker1234
412 Posts
86 Reputation
They are. one of them is liek $40 and another i believe is $95. The good news? I haven't replace a filter and my unit still spits out 12 TDS/PPM water. so unless you're using an insane amount of water, i think the filters will last you awhile. When i installed my unit, I put a $20 inline TDS meter so i can see what it's spitting out. Here [amazon.com].
Type-E
71 Posts
22 Reputation
Regular RO filters simply use water pressure to operate.
teddebee
31 Posts
10 Reputation
2:1 is more efficient than 1:1 despite what others may have posted.

136 Comments

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Mar 26, 2026 10:46 PM
6,327 Posts
Joined Aug 2010
gamingdroidMar 26, 2026 10:46 PM
6,327 Posts
Quote from Punker1234 :
Had this thing since 2021. Super solid unit. TDS creep exists but thats most undersink RO systems.
What's TDS creep?
Mar 26, 2026 10:50 PM
412 Posts
Joined Sep 2007
Punker1234Mar 26, 2026 10:50 PM
412 Posts

Our community has rated this post as helpful. If you agree, why not thank Punker1234

Quote from gamingdroid :
What's TDS creep?
TDS creep is when you first turn it on after it sitting for a little bit, the water will have absorbed some contents back and the TDS number rises. Ie, i think clean RO water is 0-25 TDS or PPM. So for instance, my local water supply is 1000-1300 (very high, Southern California) and it takes about 30 seconds for the unit to get to 20 TDS. This time will vary based on how dirty your tap water is. If you look up your water supplier, they usually post this data online somewhere.
2
Mar 27, 2026 12:21 AM
650 Posts
Joined Jun 2012
JDubb66Mar 27, 2026 12:21 AM
650 Posts
Quote from ccbadd :

This unit has a built in pump that requires power. I have an older version and plumbed it to my fridge for water and ice. Works great where my old setup without a pump barely got any water to the fridge.
Was going to ask if anyone has this going to their refrigerator. I love some good tasting ice and cold water. I have a Samsung fridge and the filter lasts maybe 6 months but slows way down when it needs replacing.
Mar 27, 2026 12:56 AM
505 Posts
Joined Aug 2008
chunmanc123Mar 27, 2026 12:56 AM
505 Posts

Our community has rated this post as helpful. If you agree, why not thank chunmanc123

Quote from teddebee :
2:1 is more efficient than 1:1 despite what others may have posted.
Thanks for pointing it out, yes 2:1 is more efficient than 1:1. That make it even better for G5P500
1
Mar 27, 2026 01:49 AM
4,770 Posts
Joined Jan 2004
Samwise GamgeeMar 27, 2026 01:49 AM
4,770 Posts
So I shouldn't have been drinking straight tap water?
2
2
Mar 27, 2026 01:55 AM
56 Posts
Joined Nov 2007
SquirrelcopMar 27, 2026 01:55 AM
56 Posts
Quote from deepaksn1 :
Anyone know how to drill hole in granite countertop to install water dispenser? What tools needed and can first time driller will able to do it?
I had to do it for my install and found a great DIY vid on YouTube. Easier than I expected
1
1
Mar 27, 2026 02:17 AM
116 Posts
Joined Apr 2020
OstafariMar 27, 2026 02:17 AM
116 Posts
I have the larger 700gph unit with alkaline ($300). Has been an excellent alternative to our previous 7 stage w/tank RO system. Much less waste, more under sink room and minimal operating noise. Easy install as well especially if your counter hole is already drilled.

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Mar 27, 2026 02:24 AM
276 Posts
Joined Jul 2009
dewdrops6Mar 27, 2026 02:24 AM
276 Posts
bought G5P500 instead of this !! I already have 7 stage ispring system, replacing with this.
Mar 27, 2026 03:59 AM
423 Posts
Joined Oct 2012
In4One1Mar 27, 2026 03:59 AM
423 Posts

Our community has rated this post as helpful. If you agree, why not thank In4One1

Quote from deepaksn1 :
Anyone know how to drill hole in granite countertop to install water dispenser? What tools needed and can first time driller will able to do it?
Not worth the risk of damaging countertop. I hired a professional plumber for $100. The tools may on their own cost about that. Plumber barely took 2 minutes to finish the job and did it very cleanly. Having insured person do it was good idea too.
2
4
Pro
Mar 27, 2026 05:03 AM
1,066 Posts
Joined Jan 2020
AmusedScent305
Pro
Mar 27, 2026 05:03 AM
1,066 Posts
Quote from In4One1 :
Not worth the risk of damaging countertop. I hired a professional plumber for $100. The tools may on their own cost about that. Plumber barely took 2 minutes to finish the job and did it very cleanly. Having insured person do it was good idea too.
Agreed. A quality bit will be $40 anyway, but a cracked granite countertop (or a crooked hole) will be a $4,000 fix. For $100-$150, leave it to a pro who already has and knows what type of bit to use.
2
4
Mar 27, 2026 05:07 AM
562 Posts
Joined Mar 2018
RedFaMar 27, 2026 05:07 AM
562 Posts
I wonder how good this filter actually is.
By the nature of RO, it's inevitable to have waster water, because the whole point it not to let every water go through the filter.
This unit seems like it has the waste water line by looking at the photo - meaning the unit is disposing the waste water.
So it's got to be either not 1:1 pure to drain, or the filter is not true RO
1
Mar 27, 2026 05:53 AM
103 Posts
Joined Dec 2006
GameXplayerMar 27, 2026 05:53 AM
103 Posts
Quote from BoastfulMeat152 :
what is the power source doing for this unit then?
Power is required for this because this is tankless and provides water on demand pumping through the filter.

The traditional RO system without power require maintaining a tank to store water as filtered water slowly fill up the tank from the water pressure that exist from your water supply line. When you are dispensing water, you get the water from the tank.
Last edited by GameXplayer March 26, 2026 at 10:57 PM.
1
Mar 27, 2026 11:54 AM
126 Posts
Joined Jun 2023
ZukmeisterMar 27, 2026 11:54 AM
126 Posts
Quote from SrMoreSun :
They need to expand the faucet color selection (eg, black and gold). Having a silver faucet with another color combo is diabolical! If they do expand, I would've bought one a looooong time ago.
They are easy to swap to any color you want. Super cheap on Amazon too
Mar 27, 2026 02:57 PM
183 Posts
Joined Jun 2023
PurpleHaddock528Mar 27, 2026 02:57 PM
183 Posts
Quote from Samwise Gamgee :
So I shouldn't have been drinking straight tap water?
Depends on where you live more than anything. Some areas the water from the tap is fine by almost anyone's standards and other areas are terrible by everyone's standards.

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Mar 27, 2026 03:14 PM
167 Posts
Joined Dec 2017
CovenantsMar 27, 2026 03:14 PM
167 Posts
Quote from Punker1234 :
They are. one of them is liek $40 and another i believe is $95. The good news? I haven't replace a filter and my unit still spits out 12 TDS/PPM water. so unless you're using an insane amount of water, i think the filters will last you awhile. When i installed my unit, I put a $20 inline TDS meter so i can see what it's spitting out. Here [amazon.com].
I was planning to replace the first filter after 12 months but the filter light has not gone off and it's been 15 months already... Do you think it's safe to wait until the light indicator or should I just replace it? How reliable is the filter indicator for these?

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