Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
Heads up, this deal has expired. Want to create a deal alert for this item?
expiredRed_Liz | Staff posted Mar 25, 2026 04:15 PM
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
Visit Amazon
Good Deal
Save
Share
Deal Details
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

Community Voting

Deal Score
+160
Good Deal
Visit Amazon

Price Intelligence

Model: Waterdrop Reverse Osmosis Water Filtration System

Deal History 

Sale Price
Slickdeal
  • $NaN
  • Today

Current Prices

Sort: Lowest to Highest | Last Updated 4/5/2026, 11:38 PM
Sold By Sale Price
Amazon$239.99

Leave a Comment

Unregistered (You)

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

Sign up for a Slickdeals account to remove this ad.

Mar 27, 2026 03:16 PM
27 Posts
Joined Sep 2013
scottj2Mar 27, 2026 03:16 PM
27 Posts

Our community has rated this post as helpful. If you agree, why not thank scottj2

Just to note, some of these Waterdrop units have an automatic flushing feature where they will flush 1l of water 5-10 mins after every use, even if you only pour a single glass of water. I couldn't find anything on this particular unit, but it's something to be aware of.
2
Mar 27, 2026 03:34 PM
5 Posts
Joined Sep 2019
OliveNose252Mar 27, 2026 03:34 PM
5 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?
It requires a contractor that does that specifically. Not worth the risk of cracking your counter.
4
Mar 27, 2026 04:29 PM
71 Posts
Joined Feb 2021
NavyWallaby409Mar 27, 2026 04:29 PM
71 Posts
Quote from OliveNose252 :
It requires a contractor that does that specifically. Not worth the risk of cracking your counter.
Do you think a plumber could do this?
1
Mar 27, 2026 04:30 PM
71 Posts
Joined Feb 2021
NavyWallaby409Mar 27, 2026 04:30 PM
71 Posts
Quote from dewdrops6 :
bought G5P500 instead of this !! I already have 7 stage ispring system, replacing with this.
Any reason you're going with the G5P500 instead of this?
Mar 27, 2026 05:00 PM
90 Posts
Joined Jun 2012
dangitzkenMar 27, 2026 05:00 PM
90 Posts
Quote from MostBased :
I own this one. I had a APEC old school unit previously. Water comes out very slowly from this one in comparison. I heard they addressed this with the newer units. Also, the G2 is NOT NSF/ANSI Standard 58 certified, which means it does not remove fluoride as much as the certified units, maybe ~85-95%. To reach that 1:1 drain ratio, the G2 likely uses a "looser" membrane or operates at a pressure where it doesn't reject quite as many ions as a 2:1 system would - this is the compromise. The Waterdrop G5P500 is 500 gallons per day (vs G2 400 GPD) and NSF/ANSI Standard 58 certified, but has a 2:1 drain ratio at a similar price point: https://a.co/d/0fqFrGxw If I could do it over, I would go for 100% flouride free drinking water over the 1:1 ratio - unless I lived in California, of course.
Thanks. Tempted to switch from my apec RO-90 to this. Any reasons not to switch?
Mar 27, 2026 05:35 PM
276 Posts
Joined Jul 2009
dewdrops6Mar 27, 2026 05:35 PM
276 Posts
Quote from NavyWallaby409 :
Any reason you're going with the G5P500 instead of this?
filtering performance is bit better , if its the same price why not.
Mar 27, 2026 06:00 PM
1,571 Posts
Joined Nov 2009
baracludeMar 27, 2026 06:00 PM
1,571 Posts
Quote from dangitzken :
Thanks. Tempted to switch from my apec RO-90 to this. Any reasons not to switch?
I had APEC for a few months. Didn't fit my use. The tank only holds maybe 2-3 gallons of water. And it takes a over an hour to fill up the entire tank. Its advertised clean to dirty water ratio is way off. More like 1:6. Swapped it out for waterdrop tankless. Instant water, never had to wait, and way less water wasted. The only downside is that their filters are expensive. And the ratio performance dropped from 2:1 to 1:1 after swapping out the old filter. I have the G2P600.
Last edited by baraclude March 27, 2026 at 11:04 AM.

Sign up for a Slickdeals account to remove this ad.

Mar 27, 2026 06:14 PM
90 Posts
Joined Jun 2012
dangitzkenMar 27, 2026 06:14 PM
90 Posts
Quote from baraclude :
I had APEC for a few months. Didn't fit my use. The tank only holds maybe 2-3 gallons of water. And it takes a over an hour to fill up the entire tank. Its advertised clean to dirty water ratio is way off. More like 1:6. Swapped it out for waterdrop tankless. Instant water, never had to wait, and way less water wasted. The only downside is that their filters are expensive. And the ratio performance dropped from 2:1 to 1:1 after swapping out the old filter. I have the G2P600.
Thanks. I've only had my Apec for a year, so far so good for my family usage honestly. The only downside is it takes up a lot of space and I'm always scared of leaks. More connection points means higher chances of leaks compared to the Waterdrop.
Mar 27, 2026 06:53 PM
12 Posts
Joined Oct 2021
Lovnlife16Mar 27, 2026 06:53 PM
12 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].
How long have you had it, and how many in the household? Just one here though water plants and 3 pets.
Mar 27, 2026 07:48 PM
412 Posts
Joined Sep 2007
Punker1234Mar 27, 2026 07:48 PM
412 Posts
Quote from Covenants :
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?
Those lights are pure estimates. It's design to get you to buy filters. It's how they make money. Either put an inline tds meter in so you can occasionally check the unit or get a handheld one. Totally worth it.
1
Mar 27, 2026 08:35 PM
145 Posts
Joined Mar 2006
AudellMar 27, 2026 08:35 PM
145 Posts
Quote from MostBased :
I own this one. I had a APEC old school unit previously. Water comes out very slowly from this one in comparison. I heard they addressed this with the newer units. Also, the G2 is NOT NSF/ANSI Standard 58 certified, which means it does not remove fluoride as much as the certified units, maybe ~85-95%. To reach that 1:1 drain ratio, the G2 likely uses a "looser" membrane or operates at a pressure where it doesn't reject quite as many ions as a 2:1 system would - this is the compromise. The Waterdrop G5P500 is 500 gallons per day (vs G2 400 GPD) and NSF/ANSI Standard 58 certified, but has a 2:1 drain ratio at a similar price point: https://a.co/d/0fqFrGxw If I could do it over, I would go for 100% flouride free drinking water over the 1:1 ratio - unless I lived in California, of course.
I have apec and the water comes out very slow. I replaced the tank and it works normally.
Mar 27, 2026 09:02 PM
7,378 Posts
Joined Sep 2014
MostBasedMar 27, 2026 09:02 PM
7,378 Posts
Quote from dangitzken :
Thanks. Tempted to switch from my apec RO-90 to this. Any reasons not to switch?
If space isn't an issue and you don't care about drain ratio, the Apec flows faster, so I would keep it.

Personally, when my G2 filters are exhausted, I will upgrade to this one for $50 more than the cost of replacement filters:

https://a.co/d/04UmA51E

800 GPD, 3:1 drain ratio, and Standard 58 certified for $200.
Mar 27, 2026 09:09 PM
7,378 Posts
Joined Sep 2014
MostBasedMar 27, 2026 09:09 PM
7,378 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)
Actually, I was mistaken in my previous post. 2:1 means 2 parts clean water to 1 part wasted water, so 2:1 is twice as efficient as 1:1.

The best modern RO purifiers are 3:1, like the $200 Stokk S2 that matches the specs of the much more expensive Waterdrop G3P800. It costs only $50 more to upgrade to this new unit than to buy replacement filters for my G2, so that's what I'm doing.

"The Stokk S2 800 GPD is a high-performance, budget-friendly system that offers double the water production of the Waterdrop G2. While the Waterdrop G2 is a well-established model known for long-term reliability, the Stokk S2 provides much better efficiency and more modern features for a similar price point." - AI summary
Last edited by MostBased March 27, 2026 at 02:15 PM.
1
Mar 27, 2026 09:56 PM
233 Posts
Joined Aug 2015
RabbitsuitMar 27, 2026 09:56 PM
233 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.
Reading some of the reviews it doesn't appear to be and the folks that called it out got a partial refund.

Sign up for a Slickdeals account to remove this ad.

Mar 27, 2026 10:59 PM
1,592 Posts
Joined Aug 2009
ddBqRvCpcFv6Mar 27, 2026 10:59 PM
1,592 Posts
I have Waterdrop G2 water filter which is older version of the this unit

1. I got $10 TDS water meter. My area tap water is 250 TDS. Filtered water is 10 TDS.

2. I installed remineralization filter to add mineral and better taste. RO water can taste... sharp and dry.

3. filter cost is not high at all one is CF carbon filter Every year and other one is RO filer every two years.

4. You would need a power outlet to use this machine. MY Apartment only has one outlet.. so I used bluetooth remote switch to control power to Garbage disposal and this water machine is constant on.

5. Never had a issue, leak, problem in 3 years

6. You would need to drill a hole in the sink. this was most pain in the ass process.

Leave a Comment

Unregistered (You)

Popular Deals

Trending Deals