[water fed bill]

Hi, I am running a  20 inch Merlin RO unit and up until the last year or so its been great but now its eating resin I am using a 5ltr resin unit and having to change the resin about once a week before it lasted about 4/5 months,
I have replaced the prefilter and the membranes, tried different brands of resin checked all the O rings and still not solved the problem, also put a big booster pump on to up the pressure to about 60psi
any suggestions much appreciated.
thanks

[chris turner]

Sounds like a problem with the resin vessel itself.  I would replace everything in the vessel except the main canister.

[water fed bill]

The reading going into the di unit is around 018-024 if thats any help. Thanks

[8weekly]

How much water are you producing?

[water fed bill]

About 1500/2000 ltrs a week

[Smudger]

5ltr resin bottle not big enough, and i would double di it.

Have you substantially increased production lately ??

If you've put in new membranes I would have expected a better performance than that

Darran

[water fed bill]

No increase in water production. Thats why I cant understand it.

[Avo]

I used to use 2x 11 litre resin vessel on mine.. Best readings I used to get were 18tds.
Either buy bigger resin bottle or 100psi booster pump to lower your output tds.

[Smudger]

What's your water tds going in?

Darran

[Matt.]

Check tds before merlin and if it's coming out at about 20, this is about right depending on tap pressure. So problem must lay with Di vessel.
I connected up to a tap the other day and the good water came out at 103 (one hundred and three ) I disconnected rite away I then tried a tap that I use regular and it was normal, so it can be hit and miss if ur not setting up the right pressure, connections, or have any leaks.
I am happy with 20 tds or less from the merlin at a decent trickle and I use about 700-1000L a week and my resin lasts forever.
I have recently been using my tank for pressure washing  a lot so have had to rinse tank through with pure going through hose and back into tank, using pole hose end, I recon it was about October when I last changed my resin and I use an 11L Di bottle in van.
My tds shows 002 today as am cleaning tank and changing resin.

I don't know much about wot could go wrong with a Di bottle other than the top screw in part or a cracked bottle.

[The Jester of Wibbly]

I had similar issue when I used a merlin system at the start.  My TDS coming out of Merlin was always high when starting it up but then settled down to normal after about 5 min. 

Have you tested TDS right at the start of filling before it goes to DI ?  and then tested it again 10 mins later?

I always disconnected the Merlin from the DI for the first 5 mins to flush it out then connected again when settled saving resin.

[Matt.]

I also do as said above let merlin run for 5 mins take regular samples to test until down to acceptable numbers