Pool Water Filtering Services

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TinFoilHat

Well-known member
Jul 14, 2023
1,317
Phoenix
I was wondering if anyone has used one of the companies with the filters and R/O-like systems in their trailer that can filter out CH from a pool while only losing 15% of the water. A coworker says that he had good results from this service and I wonder if it's worthwhile to investigate. I'm not interested in all of what they claim they remove, I just want the CH out. On the other hand, I might still drain it so I can get to the stubborn pop up floor heads that I can't get out to replace.

Thanks all.
 

Reverse Osmosis

Has anyone here done reverse osmosis? Was it effective? I just got one quote here in LA area and it was $800. This is their fee for any sized pool. I’d like to get more bids to compare, but am having trouble finding companies that do this. Anyone here in LA who has done this and have a company...
www.troublefreepool.com www.troublefreepool.com
 
kul said:
When I did RO I told them what I was going for and they were receptive and followed. Their levels were actually in line with TFP, except they did put a little more chlorine. I think you’ll be fine going this route. I tested before RO, half way point, at the end of RO, and at the end of them adding the chemicals. I also retested a few days later. It really helped me get a handle on testing and knowing where everything stood.
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Seems like a lot of options.

Have you contacted anyone?

What pricing have you seen?

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It looks like from other previous posts, mostly from Kalifornia, that it could run anywhere from $600 to $800 but I haven't gotten any pricing yet. Of course, none of their websites post any pricing which is really silly but par for the course with home repair folks here. I will probably just drain it since I need to get to the floor popups and by my calculation I will only pay about $50 to refill it. Even if I did the math wrong and the water costs me quadruple that I still save and can make the repairs needed.
 
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It’s always going to be cheaper to simply drain and refill.

Save the money and install a whole house water softener with a hook up to your autofill or a line run outside so you can top off your pool with softened water. I did that years ago (2018) and my CH barely moves. Maybe 25ppm/year whereas before the softener install CH was going up 300ppm/year.
 
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I was able to get my CH level down by dilution. I had to replumb my pool and drained the pool below the returns. I refilled from softened water over two days with regeneration overnight. I hit a bit below my target of 350.
 

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TinFoilHat said:
It looks like from other previous posts, mostly from Kalifornia, that it could run anywhere from $600 to $800 but I haven't gotten any pricing yet. Of course, none of their websites post any pricing which is really silly but par for the course with home repair folks here. I will probably just drain it since I need to get to the floor popups and by my calculation I will only pay about $50 to refill it. Even if I did the math wrong and the water costs me quadruple that I still save and can make the repairs needed.
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I did a full drain/refill in a 12k pool in Chandler a year ago and the water cost was under $30.
Refilled with unsoftened water.

I have a whole house water softener and ran a line (with backflow preventer) to the autofill. My CH rise for an entire year was less than 50 ppm. Prior to using softwater for the autofill, my CH would rise 250-350 ppm yearly do to evaporation.
 
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TinFoilHat said:
My plan is to extend my soft water from the kitchen 6 feet to the outside wall where the autofill is connected.
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Just make sure it has a serviceable 2-stage back-flow preventer on it so that you ensure safe operation of your water supply. Unfortunately, due to the slow flow nature of autofills, your water softener is unlikely to sense the extra usage so you may need to adjust your reserve volume to compensate.
 
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Hi! I did RO a few years ago and had a positive experience. We are constantly in drought here in CA so I wanted to minimize water waste and also I was a bit paranoid about my pool popping out if I drained it. I don’t know what the water table is like and probably would have been fine, but whatevs. A drain and fill is certainly cheaper.
The RO did what it was meant to do- removed my Calcium and Cya. I’d recommend calling around and seeing what’s available near you.
 
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kul said:
Hi! I did RO a few years ago and had a positive experience. We are constantly in drought here in CA so I wanted to minimize water waste and also I was a bit paranoid about my pool popping out if I drained it. I don’t know what the water table is like and probably would have been fine, but whatevs. A drain and fill is certainly cheaper.
The RO did what it was meant to do- removed my Calcium and Cya. I’d recommend calling around and seeing what’s available near you.
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Isn’t reverse osmosis the process that only has a 4:1 recovery rate? Meaning is wastes 4 gallons for every gallon of fresh water? If wasting water was the only concern, I don’t think RO would be a good solution.
 
Bperry said:
Isn’t reverse osmosis the process that only has a 4:1 recovery rate? Meaning is wastes 4 gallons for every gallon of fresh water? If wasting water was the only concern, I don’t think RO would be a good solution.
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Reverse Osmosis - Further Reading

www.troublefreepool.com www.troublefreepool.com

RO is usually more expensive than doing a water exchange and you wind up dumping about 25-30% of your water anyway. A RO operator posted that a decent RO will run anywhere from 5-15% waste.
 
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Bperry said:
Isn’t reverse osmosis the process that only has a 4:1 recovery rate? Meaning is wastes 4 gallons for every gallon of fresh water? If wasting water was the only concern, I don’t think RO would be a good solution.
Click to expand...

The low pressure taps used under kitchen sinks have very low efficiency. Typically 8:1 waste:filtered ratio. That can be improved with a permeate pump attached to the unit and probably gets it up to 3:1.

For industrial applications, you use high pressure membranes with pressurizing pumps to boost efficiency and get to about a 15% waste water fraction. But those units operate well above 150psi. Some membranes have operating points at 250psi. Typically the higher the pressure on the membrane the more efficient the RO process is but then more complex plumbing is needed which drives up cost considerably.
 
I've use RO on my Pool twice now with good results both times. The "uses only 15% of the water" is a bit optimistic, in my case both times the actual usage (as measured by my water meter) was closer to 25%. Cost last time around was $800 for my small (6500 Gallon) pool, so drain and refill will certainly be a lot cheaper.
 
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