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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: pikeman on July 04, 2018, 06:21:06 pm

Title: membane problem
Post by: pikeman on July 04, 2018, 06:21:06 pm

Got a 300 gpd ro. My tds from membrane has creeped up 39 tds water from tap is 256 tds.Just changed membranes and still around 40 tds. Been running for about 20 minutes not coming down any ideas.

Title: Re: membane problem
Post by: SB Cleaning on July 04, 2018, 07:14:24 pm

What's the water pressure like?

Title: Re: membane problem
Post by: pikeman on July 04, 2018, 07:39:42 pm

seems pretty good still only down to 38 tds same as the old membranes must be something else. Changed the fyberdine filter. Is there anything else that can wrong wth a ro.

Title: Re: membane problem
Post by: p1w1 on July 04, 2018, 08:06:37 pm

test each one separately to get individual tds reading. These small ro systems sometimes take a little while to settle down properly. Also your mains tap water tds could have risen.

Title: Re: membane problem
Post by: Spruce on July 04, 2018, 08:08:33 pm

Also, where did you get your membranes from and what make are they?

Title: Re: membane problem
Post by: nathankaye on July 04, 2018, 08:12:27 pm

When I changed my 450 gpd membranes it took a while for it to settle back down to an acceptable level, as it was before I needed to change them.

Title: Re: membane problem
Post by: david mark on July 04, 2018, 09:06:39 pm

Water temperature increase due to warmer water Total disolved solids will increase .

Title: Re: membane problem
Post by: P @ F on July 04, 2018, 09:27:09 pm

It might be worth checking the seal on the membrane outer , the big skirt one if you like thats held on with the tape , I once had a cheapie membrane that puckered a bit and did not seal properly .
All i did was take the seal off the old membrane and tape it on the new one , Tds fell straight away .   

Title: Re: membane problem
Post by: pikeman on July 05, 2018, 02:59:37 am

Many thanks for all the replies. They were bought from daqua spruce think they are called aexon

Title: Re: membane problem
Post by: Spruce on July 05, 2018, 07:55:45 am

Quote from: pikeman on July 05, 2018, 02:59:37 am

Many thanks for all the replies. They were bought from daqua spruce think they are called aexon

Might be an idea to speak to Doug about it as he will be able to help you.

Title: Re: membane problem
Post by: pikeman on July 05, 2018, 12:09:47 pm

Thank you spruce I'll do that.

Title: Re: membane problem
Post by: pikeman on July 05, 2018, 12:16:57 pm

Just an update just checked and now come down to 28 tds so going in the right direction lol.

Title: Re: membane problem
Post by: combat1 on July 05, 2018, 09:01:27 pm

Had to change my membranes a couple of times over the years.
Did you change all the prefilters and flush to waste for 1/2 hour? I also change the flow restrictor valve and then backflush for a while before using.

Title: Re: membane problem
Post by: pikeman on July 05, 2018, 10:54:50 pm

Thanks combat1 no haven't done that something to think about