Waterdrop ALK35 𝐀𝐥𝐤𝐚𝐥𝐢𝐧𝐞 Water Filter, Alkaline Filter for Reverse Osmosis System, pH Balance and Restore Minerals for RO Filter, Under Sink Water Filter, 1/4" Quick Connect

Unit was easy to install and performs as expected. Prior to installation my RO TDS was 7ppm. After installation TDS is now 27 ppm and pH is 7.8. From what I’ve read I was expecting a 20 point bump and that’s exactly what I got. Water taste is similar to some of the bottled “Smart Water” products. Both pH and TDS meters were calibrated with calibration fluids prior to test. (Leftover from planted aquarium days) I will occasionally retest to determine when replacement is required. I would be happy with 5-6 months of service. Based solely on my experience, I would recommend.

make my water taste great

I love my water drop water and this alkalizer takes it to the next level. If you’re on water drop water and you’re not using this, what are you doing?!?!? Worth every penny!

Fácil instalación Buena calidad del agua

The water filtered by this product is unsafe for drinking. The pH value of the water output from this filter is almost 9. (The water going into the filter is 6.8). This product from China may be using unknown grade calcium or sodium in inexpensive substrate to bring up the alkalinity of the water to such high level. Unsafe for drinking.

Increased our water quality and taste. Slight in grading our TDS from 001 to around 10-12

I purchased this as an add on to my existing, 3-stage, undersink RO system to improve the taste of the filtered water. Acutally it was the lack of taste that I wanted to improve. This filter does improve the taste of the water but it took a couple of days of ussage for it to kick in. Considering this is an "on-demand" type of filter, I don't understand why the improvement took a couple of days. Perhaps the filter needs to reach a saturation point before it is fully functional. I deducted one star due to the poor hardware that comes with it. The unit comes with two 1/4 to 3/8 inch adapters but the locking clips supplied are for 1/4 inch tubing. There is nothing stating whether or not locking clips are needed for the 3/8 inch side. I had some spares so I used them but it would be nice to know whether or not they are needed. The unit also comes with a low quanity mounting clip that uses a single screw. The plastic is too weak to hold the filter so it constantly falls out. The central, single screw allows the clip to rotate which also contributes to the filter falling away from the clip. I added a couple of screw mounted zip ties that hold the unit in place but they will need to be removed every time the filter needs to be changed. The label states it should be changed every six months but I've only had it two weeks so I don't know whether or not it will last six months.

it has good instruction how to install it. It was quick and easy.

Instantly noticed the change in water quality.

I bought this filter back in July 2025. This is a late review. As this filter was very easy to install there are a few concerns I have about it. 1. Customers service number works but the customer service will for sure mislead you. Fact. 2. It does not up your PH whats so ever. I know this as I went back to work for a water filtration company again. We tested it. Its just plastic with stuff in it. 3. It states it certified. I fact its not. Only there units are. 4. The web description states its certified thats not at all true. 5. Anyone with a 5 star review has no idea what there talking about. I have been in the water industry for over 25 years and I know for a fact that this is just weight in your Revirse Osmosis system. I suggest you looking elsewhere like you local water distributor that sells water and water dispensers. No not walmart. PH filter are special and must have the certificate sticker on it 100% This filter is an absolute joke and not worth the money. It's a scam 100%