You can do much more harm than good by messing with ph/hardness. Changes are worse than constant high ph. Plenty of ponders are successful with readings like that. I'm going to assume you are in Southern CA where those type readings and temperatures are to be expected. If you are in Southern CA, there are a bunch of ponders in that area with loads of experience and extra plants and maybe extra fish that are members of the American Ponders forum. Having fish die in a brand new pond is common. You should add plants and let your pond cycle before adding any more fish.

don b 1 - You say your system is sized properly at 3 tons for 1800 sq ft. That works out to be 600 sq ft/ton. But then you say that her 5 ton AC is too big for her 2900 sq foot house. Guess what that works out to - 600 sq ft/ton. So how is her's too big, but your's is right size? Jessica - Yes, a proper load calc for your specific house is needed. But, depending on the age and construction of the house - and being in the south - 600 sq ft/ton isn't all that much out of line. Again, no one on here can say if your system is too big or right sized without knowing more about age/construction/location. How long are your system's runtimes? (along with the corresponding outside temperature). Where is your ductwork located? What type of house do you have? My feeling on your situation is this. I think your main problem is infiltration. Either from leaks in the ductwork itself, or though leaky windows/doors/walls. Another thing to check is if the the fan speed on the airhandler is too high - which will hurt moisture removal. Michael

The unit may need a charge of freon - have them check the charge. They can also clean the evaporator coil (inside unit) which may be full of dust/dirt especially if they use those cheap-o blue spun fiberglass filters.

A wet bulb of 63°F at 74 RA is close to 50%RH; NOT 55%; the indoor Delta should be 18 to 19°F; NOT 14°F. Where was the indoor delta taken? Edited: The SuperHeat (SH) at 90°F ambient Edited: with fixed orifice is on target at 10°F. (I had Misread SH chart) Subcooling (SC) is on the low side. Perhaps Evaporator could be absorbing a little more heat, but the only thing off is the 14-F indoor split.