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Phyl, He may be talking about the Purolite resin and similar products. They are only good for freshwater. The problem with removing silica is that its non ionic. Its just particles small enough to be suspended in the water column. The resin is basically very porous polystyrene beads or dense...

I got mine from The Hidden Reef. I pass there every day. If you like I can pick up a box or two and bring it Saturday. But any LFS that carries the Sera products should carry it.

A few things. I remember reading a thread on RC about AWT and their testing methodologies. If I remember correctly, the silica test was in doubt. I may be wrong, but I cant find the thread. I will keep searching. As far as your RO/DI, you want a Silica Removing DI cartridge. Spectrapure has...

Linear......aka unidirectional.......constantly flowing in a single direction parallel to the surface......

I had rics that wouldn't expand and appeared to be shrinking in one spot, but others were thriving. I realized the ones not doing so well were in a laminar flow. So I moved them and almost 24hrs later they were fully expanded. Just a thought..........

I know The Hidden Reef carries it.

Any TDS meter will do, as well as some calibration fluid. If you run your own RO/DI unit, I prefer inline meters. Its just more for convenience. I would also suggest silica test and chlorine test kits, both can be present in small quantities and not show on a TDS test especially in colloidal...

If your DI is spent after only 65 gallons, then high TDS has been hitting it, which is NOT normal. Get the measurements before we jump to any conclusions.

First, I dont recommend the 100gpd membranes. For some reason, the Filmtec/Dow 100 gpd membranes only reject 90%, most of the other membranes operate at about 98%. So if you are seeing 137 TDS in you will see 13-14 TDS out with the 100gpd membrane. This just makes the DI work harder which means...

Thanks for splitting it Phil...........

You'll want to make sure the TDS meter has been calibrated. Then measure 3 things. 1. Before the RO/DI 2. Between the RO and DI 3. And after the DI What unit do you have and do you know how many GPH it is supposed to be. Even better would be the model number on the RO membrane. Another thing...

If you are truly measuring 5/6 from a new unit, then something is wrong. Start another thread and I'll see if I can help you narrow it down. Or if a mod can split this off.

My boys and I will be there... Phyl, Sadly "Steve" wont be making it. :P

When I had my problem and resolved the source of the silicates, I then ran Sera Silicate Clear media in a reactor to remove what was in the tank. Worked like a champ. But this shouldn't replace water changes or good maintenance.

I understand the process, but I wasnt aware that the pH would go that low. I thought the best I would see is the low 7's, but not into the 6's. I havent seen any reference anywhere. So I was curious as to what pH others are seeing.

I've run into an interesting dilema. On my 125g DT I run a sulphur denitrator made out of an Octopus dual chamber Cal reactor. First chamber has a few cups of sulphur beads and then filled with Seachem Matrix. The second chamber is filled with ARM. If anyone that runs a similar setup could get...

If when you calculate your needs the volume exceeds your evap, then you can use what you can to make up for the evap then supplement with something else.

If you dont measure a change in 24 hrs, then go 7 days then measure the diff. Using the example above for 150 gallons, if you want to maintain 440ppm then after 7 days its 420ppm, you would need to add 3.68 gallons of limewater over 7 days or 3.68/7 equals 0.53 gallons per day to maintain...

Yes, I had changed my post right after hitting POST... ;D

You are correct. It is for Total Volume. Because all of the water needs adjusting. Although you have sand, rock, equipment and your sump isnt filled to the top. So you do have less than that in actual volume.