[mrhasan]

Originally Posted by Delphinus

I'm sure it works fine in the end. Aquasafe has been around a while and I remember a few years ago when they first came on the scene there were a ton of Canreefers buying their units. There has to be some reason they're cheaper than average but I couldn't tell you what it is. As long as it's working and not leaking it's providing function.

With that said, I do notice they are using 100gpd membranes and not 75gpd membranes. While it might sound better because "oh hey, 25gpd more must be 25gpd better", it's actually not a huge difference in terms of the flowrate of water being produced, but in general, the 100gpd membranes tend to have a slightly lower rejection rate than 75gpd membranes. If say, your input water has tds 170, and the 75gpd outputs 1 tds (just say for example, I don't know the actual #'s) and the 100gpd outputs 2 tds, although this doesn't sound like much, you will go through way more DI in a year with the 100gpd unit than with the 75gpd unit. And the cost of that extra DI will be more than the difference in price of the membranes... So if cost is concern you want to pay more attention to the posted rejection rate over the actual gpd ratings.

There's a little more info in these two links:
http://www.bulkreefsupply.com/75-gpd...w-filmtec.html
http://www.bulkreefsupply.com/100-gp...-osmonics.html

They talk a little about rejection rates (98% vs 96%) in the descriptions of each.

I think BRS puts up the NaCl rejection rate in their description. I checked in the manual of aquasafe rodi and NaCl has a rejection rate of 99%. Alongside, it claims to have a waste ratio of 1:1 which is pretty much the best isinit?

Originally Posted by lastlight

my unit actually is an old aquasafe.

i just added an inline tds meter, backflush valve and use the third 10" canister for my DI. i have an extra valve to divert the ro output down the drain until it's around 2TDS before allowing it to enter the resin. The ro output spikes to around 80 at first and within 20 seconds currently it falls to 2 or 1.

Seems too complicated