RO water?

[Javen]

Wow y'all have blew my mind about all of this .

 

[Purpule Tang]

Thanks for all with good reply.
So,I need to change membrane for going to below of 10 tds and then insert Di resin after it.
Mr.saltyphish so your opnion is inline tds meter is wrong.right?

 

[AZDesertRat]

A good ATC temperature compensated handheld TDS meter is much better than an inline which is not truly temperature compensated so can be significantly inaccurate. I suggest the HM Digital TDS-3, TDS-4TM or AP-1, all around $25-$30 US or the COM-100 which is 10x more sensitive at low range and around $60. I own two dual inlines I never use, a COM-100 I use all the time and an AP-1 as a back up which replaced a TDS-4TM so have owned about all of them.

 

[Purpule Tang]

A good ATC temperature compensated handheld TDS meter is much better than an inline which is not truly temperature compensated so can be significantly inaccurate. I suggest the HM Digital TDS-3, TDS-4TM or AP-1, all around $25-$30 US or the COM-100 which is 10x more sensitive at low range and around $60. I own two dual inlines I never use, a COM-100 I use all the time and an AP-1 as a back up which replaced a TDS-4TM so have owned about all of them.

Mr.AZDesertRat today I bought one HM tds_3 for measuring tds membrane.I always think that inline tds meter is better than handle digital tds meter.
This I image from my new tds meter:

Thanks

 

[AZDesertRat]

Good choice! Do a little testing side by side with the inline and you will find they don't agree unless the water and air temperature are exactly the same, which is rarely the case. The handheld will be much more accurate and it has the added benefit of being portable. You can test water you have already made and stored, your tap water, bottled water etc. and not just the RO or the RO/DI water in the lines where the probes are located.