Nf 270

[Greenwich Maple Man]

Wondering how everyone who has NF 270 membranes likes them?

[mellondome]

I use the 270. They are high flowing, but if you push them too hard or too high % sugar, they can pass small amounts.

[bowhunter]

mellondome,

When you say high% sugar do you mean over 12-14%?

Thanks.

[tuckermtn]

my memetek came with nf270s in it from previous owner. I used them for two seasons and did not push above 12%. Flow rates were good. I did have some sugar passage the last season, and decided to replace with XLEs

[mellondome]

I wouldn't recommend over 10 without testing for sugar passing.

[mellondome]

If you are buying new, the xle is a lot cheaper and flows almost as fast.

[Russell Lampron]

The NF270 is fast flowing but will pass sugar if the pressure is too high or the concentration percentage is above 10 or 12%. You also have to watch the ph of the cleaning solution when you wash them. If the ph is over 9 it will open the pores and it will pass sugar at lower pressures and percentages.

The XLE has been mentioned above and my finding with that is that it is very tight and didn't pass any sugar even at 16 to 18% concentration. It can be washed at a ph of 11 like most other membranes and is a little faster than the NF90 which is also a tight membrane.

[wiam]

The NF270 is fast flowing but will pass sugar if the pressure is too high or the concentration percentage is above 10 or 12%. You also have to watch the ph of the cleaning solution when you wash them. If the ph is over 9 it will open the pores and it will pass sugar at lower pressures and percentages.

The XLE has been mentioned above and my finding with that is that it is very tight and didn't pass any sugar even at 16 to 18% concentration. It can be washed at a ph of 11 like most other membranes and is a little faster than the NF90 which is also a tight membrane.

And the specs say it won't hurt the xle to hit pH 13 for short time...... Not saying mine has....

[Russell Lampron]

And the specs say it won't hurt the xle to hit pH 13 for short time...... Not saying mine has....

When I bought my RO the manual said to use 1/2 a container of soap per wash. I never did thanks to the people in the know here. I can only imagine what the ph would have been with that much soap. It only takes 2 or 3 ounces to get to ph 11.

[miohman]

Your RO soap has a buffing compound that doesn't allow it to go above a certain pH. By adding more that is needed to just just bring the pH up say to 10, the compounds keep the wash water at a pH of 10 through out the whole wash. Where as if you only put enough soap in to originally bring the pH up to 10, as you wash the pH in you wash tank will fall.

[Flat Lander Sugaring]

Your RO soap has a buffing compound that doesn't allow it to go above a certain pH. By adding more that is needed to just just bring the pH up say to 10, the compounds keep the wash water at a pH of 10 through out the whole wash. Where as if you only put enough soap in to originally bring the pH up to 10, as you wash the pH in you wash tank will fall.
so what your saying is I could take a whole container of soap dump it in my 5 gal wash bucket and the ph will never go above 11 or so?

[wiam]

Well either the soap I use is not buffered or my meter needs calibrating.

[miohman]

I should modify my previous statement. The lapieere soap I know has the buffer. I assumed that all ro soaps would as well but That may not be the case.