03-18-2012, 11:18 PM
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You don't 'need' Prime unless you suspect issues with ammonia, nitrites, nitrates or heavy metals in your well water. I'm not sure why you suspect phosphates in your well water, but if you live in an agricultural area, nitrates are a strong possibility so you should test your well water.
There are products you can use in your filter to adsorb phosphates. Fluval Clearmax is one that claims to deal with phosphates.
A brita filter probably isn't feasible, although an API Tap Water filter may be more appropriate.
Some might suggest an RO/DI system ($100 - $500), but if your [well] water system is like mine, you wouldn't have consistent 50+psi for the RO membrane function without a booster pump (which increases the cost and complexity of the installation). Also, RO systems produce around 4 gallons of waste water for every gallon of RO or RO/DI water.