I used the enemas for getting rid of candida. I used about 1 tsp per cup of water of unfiltered, organic ACV after using 1 ttsp per cup of water of 3% hydrogenperoxide.
As far as hardened feces I can only guess. I would wonder if you are drinking enough water. All I can do is paste what I personally found helpful for constipation. Also, have you tried good ol' organic prune juice along with increased water?
Do you have enough probiotics in your system? You can get them in tablet form, though I don't know which would be best to recommend & if all work. For sure acidophilus yogurt, natural (not cooked in a can with pasturization) sauerkraut (easy to make), kefir, and things like rejuvelac (ultra easy to make) can help you get probiotics. Reportedly they don't just help with constipation but with many ailments both physical & mental. See Youtube with Dr. Mercola and Dr. Campbell for ex. (and it's not just about autism, if you keep listening.)
***SOME HELPS FOR CONSTIPATION & JUST TO UNBLOCK THE BOWELS WHILE CLEANSING:
If you eat 2 quarts of airpopped, hopefully organic, popcorn with minimal to no oil or butter (maybe some coconut oil) and a small Watermelon all in one day you should start getting cleaned out due to all that roughage for one thing.
Taking 2-3 capsules of magnesium before bedtime has helped many people. I personally think brand can make all the difference and have found Twinlab (cheaper at places like Vitacost & iherb) to be very good.
Some people really like Oxypowder but I have found that it seems to deplete my electrolytes or something because it made me feel very tired after a couple of days.
Blessed Herbs is, mho, the best bowel cleanser, but pricey.
You can do maybe 1 high enema a week w/o getting dependent on enemas, and low enemas (2-4 cups at a time) will cause no dependency so use as often as helpful. Be sure to eat acidoophilus yogurt to replenish good bacteria. Dannon sells this in the plain, usually non fat, no Sugar etc. added version.
Some people use cascara sagara and it is effective, but you can get dependent on it. One way to counteract that dependency at least somewhat, if you find it's all that works, is to not take it every day. Chia seeds mixed in with soup or green drinks can be very helpful Ė though it may take a week or two for the effect to be seen.
It wouldn't hurt to put some quassia "tea" (you buy the chips & let them steep in hot water just like tea) and/or Black-Walnut or Black-Walnut /womrwood (again available at places like Vitacost) tincture into the last enema bag, and they can help kill any parasites.