Reverse Osmosis On-Demand

iShatterBladderz

Cannabis Connoisseur
I’m sure many of you all have done this before or could easily figure it out, but I figured I’d post it just in case someone on here has been trying to figure out how to rig something like this up.

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The hardest part was buying the RO filter and waiting for it to arrive. I did a little bit of local shopping around, but couldn’t find anybody with the model I was after (Hydrologic Stealth 150 w/ upgraded KDF Carbon Filter) so I ordered it online from GrowGeneration’s website, GrowGen.pro, formerly known as HeavyGardens. The only things I used were:

Hydrologic Stealth 150 w/ upgraded KDF Carbon Filter from GrowGen.Pro - $170 (other sites sell it for a little bit cheaper, but I had a promo code, plus they had a special where if you spent over $150 you got a free t-shirt)
55 gallon tote from Lowe’s - $18
Float valve from Amazon - $20
(there are cheaper ones but I went with hydrologic’s version because it came with a 1/4” quick connect)
Aquarium pump from Amazon - $14
Soft Plastic Tubing ~$8
(I have a bunch of this for building PC water-cooling systems but Amazon also carries this as well as grow stores and pet stores)
Surge Protector - $10
Zip ties - $3


The van is an old vehicle that never gets driven, and isn’t far from where our drain is, so I used the rear windshield wiper to keep the surge protector from where water could get on it. It fills up to right around 50 gallons before the float valve closes and the filter turns off. The pump is inside the reservoir, anytime I need water I just flip on the surge protector and use the tubing coming out of the pump like a hose. Fairly easy to set up and now I have ~3 PPM water available on demand. Just thought I’d share in case anyone was considering getting an RO filter. Will work the same with any RO filter, of course, as long as it has an automatic shut off valve built in.
 

shimz

vapest
Why not a surge tank? Not to crap on your design (which i do admire), but this seems over complicated. I recommend you put the reservoir up high and use gravity instead of a pump. You can leave the surge tank on the ground because it pumps the water by means of an air bladder.
 

iShatterBladderz

Cannabis Connoisseur
Why not a surge tank? Not to crap on your design (which i do admire), but this seems over complicated. I recommend you put the reservoir up high and use gravity instead of a pump. You can leave the surge tank on the ground because it pumps the water by means of an air bladder.
I don’t even know what a surge tank is. I have zero knowledge of water systems outside of water-cooling for PC’s. I just drilled a hole for the float valve and dropped a pump in, and I’m golden. Only had to buy the plastic tote and the float valve, I had everything else already.
 

iShatterBladderz

Cannabis Connoisseur

This the one I use. An old well tank would work as well. These have air bladders in them that act like pumps when filled.
Ah, I wasn’t looking to spend that kind of money. I only had to spend $40 to get this put together, and I could have done it for $30. Plus I would need much bigger, I have two 20 gal reservoirs I fill every 4-5 days. This setup fills to 50 gallons so even if both reservoirs need to be filled on the same day, I’m good.
 

shimz

vapest
I do like the extra capacity of your system. If you look around you might find a used well tank for free.

I only need 5 gallons at a time, so the ROT14 is the perfect solution for me. See my Doser thread for details if interested.
 

Turpman

Grow God
I use a 45g barrel mount up hi to feed RO into. Gravity from there. Always have good water and no pailing.
 
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