Replacement R.O filters

[AndyArms]

Hi everyone. I'm looking to find out if anybody knows which filters I need for my system here on the photograph.

I can't see any model number or anything else which gives the specific information, so I'd be very grateful if anybody could help.

I bought the system second hand around two years ago and only use maybe 200 litres per month, but while I've got the money I think it's wise to buy some replacement filters for the future.

Many thanks..

 

[Iron Giant]

10 inch pre-filters buy from daqua.co.uk you will need a sediment filter in number 1 and a carbon filter in number 2 just take out the gac filter inside number 3 and reattach the housing and forget about it because it isn't needed

 

[AndyArms]

Thank you, Iron giant for the great advice. I'll get some ordered.

One last question if it's ok....

Do the R.O membranes need changing out also. I opened one up and it's this type ...It was full of sediment

axeon membrane element model.
tf 1812 150.

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I'm sorry for the very novice questions, but I really do appreciate the advice.

Many thanks... Andrew

 

[AndyArms]

I'm sorry for being a bit vague with my question. I'm getting 000 ppm on my TDS . I think I will leave the membranes alone for now and just change the filters out.

If it ain't broke, don't fix it !!! ?

Thank you to Iron Giant again ?

 

[Iron Giant]

I'm sorry for being a bit vague with my question. I'm getting 000 ppm on my TDS . I think I will leave the membranes alone for now and just change the filters out.

If it ain't broke, don't fix it !!! ?

Thank you to Iron Giant again ?

That's what I'd have done, your pre-filters will help protect your membranes and need changing per the manufactures guidance

 

[spruce]

You will always get 0ppm from after your di vessel if the resin is fresh @AndyArms

When you need to change membranes is when they stop performing to spec. Ideally, your membranes should be removing around 98% of your tap water's TDs. That leaves 2ppm for every 100ppm of tap water for your resin to polish off.

Let your r/o run for 10 minutes and then test the pure water leaving your r/o before di.

They used to say that it was time to change membranes when they were only removing 94% of the tap waters dissolved solids. But that depends on your weekly water usage.

Formula. Let's say you tap water is 150ppm and the pure from the r/o is 4ppm.
150 - 4 = 146.146 divided by 150 = 0.973 multiply by 100 = 97.3%.

If your pure was 9 then that would equate to 94%

If it was 15 then the membranes would be suspect and probably need changing.

 

[AndyArms]

Thank you for the very helpful replies and making the information sink in a little easier.

It's quite daunting understanding all of the procedures involved, but it's becoming more clear the more I read.

Thank you again... Andrew

 

[spruce]

When it comes time to change your membranes you can fit a number of different capacity membrane in those housings. My first r/o had 3 x 75gpd membranes. I replaced them with 3 x 150gpd membranes which doubled my production.

 

[spruce]

When it comes time to change your membranes you can fit a number of different capacity membrane in those housings. My first r/o had 3 x 75gpd membranes. I replaced them with 3 x 150gpd membranes which doubled my production.

Sorry, ignore this. You already have 150gpd membranes in your r/o