Originally Posted by SkinnyPete
was purchased about 4 months ago and I have not changed it as of yet. How often should this be done? I was planning on replacing everything after 6 months, but I should probably be measuring by gallon not months I suppose. Not sure what the TDS
out of the unit is
You cannot accurately judge the performance of the unit by time or gallons processed. You need to get a TDS
meter. When TDS
starts to rise, it tells you when it's time to change the DI
resin. As far as the RO
membrane, it can last as long as 3 years or so but that greatly depends on the TDS
of the water being filtered and the quality of the membrane itself/temp of the water going in.
, but I started the tank with tap water (at the suggestion of a lfs) and my PO4 has been 1ppm ever since even with top offs and water changes with RO/DI, which is why I'm thinking it might be the rock/overfeeding.
One thing to note about PO4
is that it's an endless cycle being converted from inorganic to organic in an endless circle. Once in the system it's PITA to be rid of. Starting with tap water is not always bad but again depends on the TDS
of the tap water. The higher it is the worse. CC
is also a great contributor depending on the % of snail shells in the mix. PO4
can easily end up bound up in the rock through bacteria. If it's one piece of rock you suspect, just remove it to a pail with a powerhead for a month or so. It will eventually burn itself out without further introduction of nutrient fueling it.
So, I will test the RO/DI water tomorrow, maybe run some phosphate sponge product?, cyphon out cyano and do weekly water changes to try and get it under control? Another factor is my recently demolished clean-up crew. Had a large 'hiker crab that had a feast on my snails/hermits - so they need to be replaced.
Test the tap and RO
with a TDS
if possible. You can also test the rock for PO4
easily enough and eliminate which one (if any) are a problem. Simpley place your syringe against the largest rocks and take a sample one by one testing the results. The "offender" should be easily spotted. PO4
removal products work well if the right type, be sure it's iron oxide based and you should be fine.
As far as your clean up crew, yes they will help but be sure the hair algae is well pruned. They will ignore it otherwise. Tuxedo urchins are really the best means of control there IMO
. As for the cyano
, the best and only (IME
) animal control there are strombus snails.