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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
140 Comments 91,350 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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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.

140 Comments

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Mar 28, 2026 01:02 AM
123 Posts
Joined Apr 2020
OstafariMar 28, 2026 01:02 AM
123 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.
Mar 28, 2026 01:18 AM
155 Posts
Joined Oct 2009
jalmarMar 28, 2026 01:18 AM
155 Posts
Quote from tommytg :
If the claim of 1:1 vs 1:4 is true, I figure it will pay for itself in about a year. In for 1.
in the waterdrop G2 specification , it says 2:1
Mar 28, 2026 01:20 AM
155 Posts
Joined Oct 2009
jalmarMar 28, 2026 01:20 AM
155 Posts
Quote from tommytg :
If the claim of 1:1 vs 1:4 is true, I figure it will pay for itself in about a year. In for 1.
in the waterdrop website for G2 specification , it says 2:1
Mar 28, 2026 04:03 AM
4,797 Posts
Joined Jan 2004
Samwise GamgeeMar 28, 2026 04:03 AM
4,797 Posts
Quote from Punker1234 :
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.
Is there a meter or sensor that tell when tds creep has lowered? Regular tap I'm told to leave running for 10sec, before use/drinking. Guessing it's same idea?
Mar 28, 2026 04:07 AM
412 Posts
Joined Sep 2007
Punker1234Mar 28, 2026 04:07 AM
412 Posts
Quote from Samwise Gamgee :
Is there a meter or sensor that tell when tds creep has lowered? Regular tap I'm told to leave running for 10sec, before use/drinking. Guessing it's same idea?
On this unit, no. You'll often see units with a meter built into the water dispenser. Honestly, if you have decent water in your area, 10 seconds. If you have really bad like mine, 30 seconds is more than enough.
Mar 28, 2026 04:25 AM
271 Posts
Joined Feb 2013
Jenn.hMar 28, 2026 04:25 AM
271 Posts
Quote from test_subj :
Tempted, but the only power under my sink is for the disposal. Needing an active plug under the sink kills it for me.
I had the same issue. I solved it by splitting the power and added a remote controller to the disposal. The filter gets constantly plugged. It works fine so far.
Mar 28, 2026 04:33 AM
271 Posts
Joined Feb 2013
Jenn.hMar 28, 2026 04:33 AM
271 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?
You don't have to. A solution is to replace your faucet with something like this: https://a.co/d/0h6sRlrp there are many similar products in the market. The spray on this one is way too firm but it works
Last edited by Jenn.h March 27, 2026 at 09:36 PM.

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Mar 28, 2026 10:37 AM
1,595 Posts
Joined Aug 2009
ddBqRvCpcFv6Mar 28, 2026 10:37 AM
1,595 Posts
Quote from Jenn.h :
I had the same issue. I solved it by splitting the power and added a remote controller to the disposal. The filter gets constantly plugged. It works fine so far.

https://www.amazon.com/DEWENWILS-...9hdGY&th=1
Mar 28, 2026 02:46 PM
434 Posts
Joined Jul 2012
marcski1Mar 28, 2026 02:46 PM
434 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?
Diamond hole saw bit, there is no pilot so you start on one side til it bites, the rotate around slowly until you have enough to guide the bit down straight. If you go slow and let the bit do the work, this has worked every time for me. You could also use a bit of water trickled while drilling for cooling and to control dust as you go. Local home stores should carry the diamond encrusted bit in small sizes
Mar 28, 2026 03:15 PM
269 Posts
Joined Feb 2010
LLLosingitMar 28, 2026 03:15 PM
269 Posts
These are not cost effective, the replacement filters are almost as much as a new unit, although some people will have the filters last a couple years most will not.
1
1
Mar 28, 2026 03:49 PM
2 Posts
Joined Nov 2016
cire808Mar 28, 2026 03:49 PM
2 Posts
Quote from chunmanc123 :
I also think the G5P500 for $189 is a better deal than G2 unless you really care about water waste. G5P500 is 2:1 and G2 is 1:1 (less water waste)
Pure to drain
1 gallon pure to 1 gallon drain

The 2:1 on the G5P500 is more efficient and officially certified to both NSF/ANSI 58 & 372, while the G2 is "tested to" NSF/ANSI 58 standards. They are not officially certified.
Mar 28, 2026 04:32 PM
772 Posts
Joined Feb 2019
joebellsMar 28, 2026 04:32 PM
772 Posts
Can you add a remineralizer? I had an APEC setup at the exs that was a number of different stages, then it went to RO, then it went to two more things the last one adding minerals back to the water.
Mar 28, 2026 04:34 PM
772 Posts
Joined Feb 2019
joebellsMar 28, 2026 04:34 PM
772 Posts
Quote from Cheesecycle :
Curious how else you would expect to power it?
I am used to an APEC system that requires no power. What does this use electricity for?
Mar 28, 2026 04:52 PM
557 Posts
Joined Jan 2008
CheesecycleMar 28, 2026 04:52 PM
557 Posts
Quote from joebells :
I am used to an APEC system that requires no power. What does this use electricity for?
There's a pump that facilitates a higher flow rate than traditional systems.

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Mar 28, 2026 05:59 PM
112 Posts
Joined Nov 2010
drjd888Mar 28, 2026 05:59 PM
112 Posts
Ended up ordering the G3P600 for $399 instead for the increased efficiency (2:1 vs 1:1), better filtration (more certifications), faster flow and built in digital TDS meter. The coupon code for the G2P400 didn't work for the G3P600.

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