Hello, and welcome to the forum!!
I moved your post into this new thread so that all the views and replies you get will all be in response to this post. When you add a question post into somebody else's thread, it gets confusing for the people that are trying to help you.
The slippery biofilm that you feel is almost certainly an algae bloom about to happen, as you have figured out. And the way to get rid of it is to shock the pool and maintain the shock level until the algae is dead. The question is....what is shock level for you? That's going to depend on your CYA level, which we need in order to tell you how high to raise the chlorine. Also, we need to know the total volume of your pool in order to calculate the chlorine dose. You definitely need to get a good test kit--pool store testing is designed to sell chemicals, not correct pool problems, so you don't want to have to depend on them if you can help it. We highly recommend the K-2006 or K-2006C (same kit, bigger reagent sizes in the C version) that can be purchased online--there's a link in my sig to the Amazon page where the Poolforum gets a donation from the sale if it's bought through that link. Only buy it if Amato Industries is the seller, though--if they're not listed, wait a day or so until they restock. Some of the other sellers are substituting a different kit that is not as well suited for what you'll need. In the meantime, go to WalMart, Lowes, Home Depot, or anywhere else that pool stuff is sold and get the OTO kit--it is cheap and uses red and yellow drops to measure pH and chlorine. Most of those only test chlorine up to 3 ppm, but you can force it to read higher chlorine levels as described here http://www.poolsolutions.com/gd/how-...d-testkit.html.
Go ahead and have Leslie's test your water--there's no reason why they shouldn't give you the results. They'll also try to sell you a bunch of stuff you don't need, so resist the temptation to buy it--no algaecide, no calcium, no phosphate remover, nothing. Just tell them you have it at home already and just needed to find out what to add. While you're out, go get several gallons of plain, unscented bleach, which is what most of us at this forum use for shocking.
Come back, post your test results, and we'll be happy to get you going in the right direction!
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