[AJ]

If i connect a pressure washer (just a very small electric one) after a 4040 RO, what are the implications when the trigger isnt on?
Will the back up of pressure ruin the membrane?

Any thoughts welcome

Cheers
Alan

[PoleKing]

Only a guess but I can't see it doing any damage.
When the trigger is pulled I think it'd be a different matter though!

Why are you doing it?

[Rob@Blast off]

Use a buffer tank of some sort.

[AJ]

we have some plastic cladded ceilings to do. About 2000m2. They have tried pressure washing them with tap water but it left them badly spotted. They have asked us to WFP them, but i cant help thinking there is an easier way.
The RO won't produce quick enough to run a 15LPM from a tank for any length of time.
So i thought, low LPM through the RO might work

[PoleKing]

Fair enough.
Now they've been covered in tap water, just pure won't get them clean though.
If they'd been done with pure to start, you may have been ok.
I'd say they'll now need a chemical and a proper hard work scrub to come up nice.

Like blast off has said though-use a buffer tank.
If you can get 1000 litres in front and regular tea breaks you may not catch yourself up.
Just my opinion/experience.

[AJ]

They only did a couple of test panels, thankfully.
We dont have low LPM washer that will draw from a tank, which is sort of where the thought process started.

[PoleKing]

They only did a couple of test panels, thankfully.
We dont have low LPM washer that will draw from a tank, which is sort of where the thought process started.

Fair enough.

In my experience cladding does need an agitant (is that a word?) rather than just PW though.
If they've done a few test panels, why not do the next few test panels WFP?
And perhaps a few with a chemical?
Then the customer has got;
Before, after water, after pure water and after chemical to compare directly.
Then give a price for each finish...?

[AJ]

The pricing is fine and the pure water finish is fine.

I just wondered about jetting via an RO. Brushing ceilings is hard work.

[PoleKing]

The pricing is fine and the pure water finish is fine.

I just wondered about jetting via an RO. Brushing ceilings is hard work.

Cool.
Yup, I concur!
We used to do a cold store at 30 feet high, walls & ceilings.
Back breaking work.
Is that what you're doing, a cold store?

In all seriousness (if it is a cold store) have you tried dry brushing? Then pure rinse? Done twice, yes, but less effort overall...

[AJ]

its all external at aound 4-5m high.

any takers? is possible to Jet wash through ro?